Datasets:
Tasks:
Question Answering
Sub-tasks:
extractive-qa
Languages:
English
Size:
1M<n<10M
ArXiv:
License:
| 0 Making sense of principal component analysis, eigenvectors & eigenvalues | |
| 1 How to choose the number of hidden layers and nodes in a feedforward neural network? | |
| 2 What is the difference between likelihood and probability? | |
| 3 What is the intuition behind beta distribution? | |
| 4 What is the difference between test set and validation set? | |
| 5 Why square the difference instead of taking the absolute value in standard deviation? | |
| 6 Relationship between SVD and PCA. How to use SVD to perform PCA? | |
| 7 The Two Cultures: statistics vs. machine learning? | |
| 8 How to understand the drawbacks of K-means | |
| 9 Bayesian and frequentist reasoning in plain English | |
| 10 Explaining to laypeople why bootstrapping works | |
| 11 Python as a statistics workbench | |
| 12 When conducting multiple regression, when should you center your predictor variables & when should you standardize them? | |
| 13 What happens if the explanatory and response variables are sorted independently before regression? | |
| 14 What is your favorite data analysis cartoon? | |
| 15 What is the difference between fixed effect, random effect and mixed effect models? | |
| 16 Difference between logit and probit models | |
| 17 How to normalize data to 0-1 range? | |
| 18 Is normality testing essentially useless? | |
| 19 Why is Euclidean distance not a good metric in high dimensions? | |
| 20 What is the trade-off between batch size and number of iterations to train a neural network? | |
| 21 How to understand degrees of freedom? | |
| 22 Bagging, boosting and stacking in machine learning | |
| 23 Whats the difference between a confidence interval and a credible interval? | |
| 24 What is the meaning of p values and t values in statistical tests? | |
| 25 Famous statistical quotations | |
| 26 What does AUC stand for and what is it? | |
| 27 Why does a 95% Confidence Interval (CI) not imply a 95% chance of containing the mean? | |
| 28 What should I do when my neural network doesnt learn? | |
| 29 Interpretation of Rs lm() output | |
| 30 Is $R^2$ useful or dangerous? | |
| 31 How would you explain Markov Chain Monte Carlo (MCMC) to a layperson? | |
| 32 Is there any reason to prefer the AIC or BIC over the other? | |
| 33 How would you explain covariance to someone who understands only the mean? | |
| 34 What is batch size in neural network? | |
| 35 What are common statistical sins? | |
| 36 What are the differences between Factor Analysis and Principal Component Analysis? | |
| 37 How to know that your machine learning problem is hopeless? | |
| 38 How to choose a predictive model after k-fold cross-validation? | |
| 39 What is the best introductory Bayesian statistics textbook? | |
| 40 Algorithms for automatic model selection | |
| 41 What is the difference between data mining, statistics, machine learning and AI? | |
| 42 Which mean to use and when? | |
| 43 When (and why) should you take the log of a distribution (of numbers)? | |
| 44 How should I transform non-negative data including zeros? | |
| 45 ROC vs precision-and-recall curves | |
| 46 How to interpret a QQ plot | |
| 47 Why is Newtons method not widely used in machine learning? | |
| 48 What does the hidden layer in a neural network compute? | |
| 49 When should I use lasso vs ridge? | |
| 50 In linear regression, when is it appropriate to use the log of an independent variable instead of the actual values? | |
| 51 Can principal component analysis be applied to datasets containing a mix of continuous and categorical variables? | |
| 52 How to deal with perfect separation in logistic regression? | |
| 53 Rs lmer cheat sheet | |
| 54 What is a data scientist? | |
| 55 How do I get the number of rows of a data.frame in R? | |
| 56 How to summarize data by group in R? | |
| 57 PCA on correlation or covariance? | |
| 58 How exactly does one “control for other variables”? | |
| 59 Generative vs. discriminative | |
| 60 Intuitive explanation for dividing by $n-1$ when calculating standard deviation? | |
| 61 Why the sudden fascination with tensors? | |
| 62 What are the advantages of ReLU over sigmoid function in deep neural networks? | |
| 63 What intuitive explanation is there for the central limit theorem? | |
| 64 How to determine which distribution fits my data best? | |
| 65 Statistics Jokes | |
| 66 Why do we need sigma-algebras to define probability spaces? | |
| 67 A list of cost functions used in neural networks, alongside applications | |
| 68 Choice of K in K-fold cross-validation | |
| 69 Can a probability distribution value exceeding 1 be OK? | |
| 70 Training on the full dataset after cross-validation? | |
| 71 Whats the difference between variance and standard deviation? | |
| 72 What does 1x1 convolution mean in a neural network? | |
| 73 Cohens kappa in plain English | |
| 74 Why is accuracy not the best measure for assessing classification models? | |
| 75 Does Julia have any hope of sticking in the statistical community? | |
| 76 What is the influence of C in SVMs with linear kernel? | |
| 77 How does Keras Embedding layer work? | |
| 78 Gradient Boosting Tree vs Random Forest | |
| 79 How to intuitively explain what a kernel is? | |
| 80 Are large data sets inappropriate for hypothesis testing? | |
| 81 What is the difference between a consistent estimator and an unbiased estimator? | |
| 82 Whats the difference between Normalization and Standardization? | |
| 83 What is the difference between a neural network and a deep neural network, and why do the deep ones work better? | |
| 84 Bottom to top explanation of the Mahalanobis distance? | |
| 85 Whats the difference between principal component analysis and multidimensional scaling? | |
| 86 R vs SAS, why is SAS preferred by private companies? | |
| 87 When is it ok to remove the intercept in a linear regression model? | |
| 88 Deriving the conditional distributions of a multivariate normal distribution | |
| 89 The Sleeping Beauty Paradox | |
| 90 How to reverse PCA and reconstruct original variables from several principal components? | |
| 91 Amazon interview question—probability of 2nd interview | |
| 92 How are the standard errors of coefficients calculated in a regression? | |
| 93 Why are p-values uniformly distributed under the null hypothesis? | |
| 94 Correlations with unordered categorical variables | |
| 95 Does causation imply correlation? | |
| 96 How to choose between Pearson and Spearman correlation? | |
| 97 Help me understand Bayesian prior and posterior distributions | |
| 98 Is Facebook coming to an end? | |
| 99 Pearsons or Spearmans correlation with non-normal data | |
| 100 Obtaining knowledge from a random forest | |
| 101 Crossed vs nested random effects: how do they differ and how are they specified correctly in lme4? | |
| 102 When is R squared negative? | |
| 103 Batch gradient descent versus stochastic gradient descent | |
| 104 Whats the difference between probability and statistics? | |
| 105 Objective function, cost function, loss function: are they the same thing? | |
| 106 What is the difference between linear regression and logistic regression? | |
| 107 Why normalize images by subtracting datasets image mean, instead of the current image mean in deep learning? | |
| 108 Why L1 norm for sparse models | |
| 109 What is the difference between convolutional neural networks, restricted Boltzmann machines, and auto-encoders? | |
| 110 Should one remove highly correlated variables before doing PCA? | |
| 111 What if residuals are normally distributed, but y is not? | |
| 112 What is the difference between linear regression on y with x and x with y? | |
| 113 Why does a time series have to be stationary? | |
| 114 Percentile vs quantile vs quartile | |
| 115 What is the .632+ rule in bootstrapping? | |
| 116 Whats wrong with XKCDs Frequentists vs. Bayesians comic? | |
| 117 Differences between cross validation and bootstrapping to estimate the prediction error | |
| 118 Free statistical textbooks | |
| 119 What is the difference between off-policy and on-policy learning? | |
| 120 Difference between neural net weight decay and learning rate | |
| 121 Numerical example to understand Expectation-Maximization | |
| 122 Why does the Cauchy distribution have no mean? | |
| 123 Is there an intuitive interpretation of $A^TA$ for a data matrix $A$? | |
| 124 Removal of statistically significant intercept term increases $R^2$ in linear model | |
| 125 Nested cross validation for model selection | |
| 126 How would you explain the difference between correlation and covariance? | |
| 127 How does a Support Vector Machine (SVM) work? | |
| 128 What exactly are keys, queries, and values in attention mechanisms? | |
| 129 Most interesting statistical paradoxes | |
| 130 Books for self-studying time series analysis? | |
| 131 Clustering on the output of t-SNE | |
| 132 At each step of a limiting infinite process, put 10 balls in an urn and remove one at random. How many balls are left? | |
| 133 How to choose between t-test or non-parametric test e.g. Wilcoxon in small samples | |
| 134 When to use gamma GLMs? | |
| 135 Assessing approximate distribution of data based on a histogram | |
| 136 ASA discusses limitations of $p$-values - what are the alternatives? | |
| 137 Bias and variance in leave-one-out vs K-fold cross validation | |
| 138 If 900 out of 1000 people say a car is blue, what is the probability that it is blue? | |
| 139 Is it possible to have a pair of Gaussian random variables for which the joint distribution is not Gaussian? | |
| 140 Whats a real-world example of overfitting? | |
| 141 What skills are required to perform large scale statistical analyses? | |
| 142 Intuitive explanation of unit root | |
| 143 Comprehensive list of activation functions in neural networks with pros/cons | |
| 144 What misused statistical terms are worth correcting? | |
| 145 PCA and proportion of variance explained | |
| 146 Why are neural networks becoming deeper, but not wider? | |
| 147 Is it possible to train a neural network without backpropagation? | |
| 148 Where should I place dropout layers in a neural network? | |
| 149 What is an embedding layer in a neural network? | |
| 150 Difference between confidence intervals and prediction intervals | |
| 151 Maximum Likelihood Estimation (MLE) in layman terms | |
| 152 Detecting a given face in a database of facial images | |
| 153 How do you calculate precision and recall for multiclass classification using confusion matrix? | |
| 154 tanh activation function vs sigmoid activation function | |
| 155 KL divergence between two univariate Gaussians | |
| 156 Difference between standard error and standard deviation | |
| 157 What does a closed-form solution mean? | |
| 158 US Election results 2016: What went wrong with prediction models? | |
| 159 When should linear regression be called machine learning? | |
| 160 Calculating optimal number of bins in a histogram | |
| 161 What is covariance in plain language? | |
| 162 How to select kernel for SVM? | |
| 163 Conditional inference trees vs traditional decision trees | |
| 164 How to annoy a statistical referee? | |
| 165 T-test for non normal when N>50? | |
| 166 What loss function for multi-class, multi-label classification tasks in neural networks? | |
| 167 What are the main differences between K-means and K-nearest neighbours? | |
| 168 What is rank deficiency, and how to deal with it? | |
| 169 Best series of colors to use for differentiating series in publication-quality plots | |
| 170 Why use gradient descent for linear regression, when a closed-form math solution is available? | |
| 171 Locating freely available data samples | |
| 172 Why does the Lasso provide Variable Selection? | |
| 173 Explain Curse of dimensionality to a child | |
| 174 What book would you recommend for non-statistician scientists? | |
| 175 Softmax vs Sigmoid function in Logistic classifier? | |
| 176 Does an unbalanced sample matter when doing logistic regression? | |
| 177 Diagnostic plots for count regression | |
| 178 Is this really how p-values work? Can a million research papers per year be based on pure randomness? | |
| 179 Whats the difference between correlation and simple linear regression? | |
| 180 Using k-fold cross-validation for time-series model selection | |
| 181 What is the difference between zero-inflated and hurdle models? | |
| 182 Including the interaction but not the main effects in a model | |
| 183 Validation Error less than training error? | |
| 184 How scared should we be about convergence warnings in lme4 | |
| 185 Is there an intuitive explanation why multicollinearity is a problem in linear regression? | |
| 186 Interpreting plot.lm() | |
| 187 What is the best way to identify outliers in multivariate data? | |
| 188 What is the role of the logarithm in Shannons entropy? | |
| 189 What are examples where a naive bootstrap fails? | |
| 190 Why do we need to normalize data before principal component analysis (PCA)? | |
| 191 Simple algorithm for online outlier detection of a generic time series | |
| 192 Understanding variance intuitively | |
| 193 Can someone explain Gibbs sampling in very simple words? | |
| 194 What is the benefit of breaking up a continuous predictor variable? | |
| 195 Why isnt Logistic Regression called Logistic Classification? | |
| 196 Generate a random variable with a defined correlation to an existing variable(s) | |
| 197 What, precisely, is a confidence interval? | |
| 198 Why is ANOVA taught / used as if it is a different research methodology compared to linear regression? | |
| 199 Under what conditions does correlation imply causation? | |
| 200 How to choose nlme or lme4 R library for mixed effects models? | |
| 201 Is there a way to remember the definitions of Type I and Type II Errors? | |
| 202 Feature selection and cross-validation | |
| 203 How much do we know about p-hacking in the wild? | |
| 204 How to calculate Area Under the Curve (AUC), or the c-statistic, by hand | |
| 205 Who Are The Bayesians? | |
| 206 Essential data checking tests | |
| 207 What is the relation between k-means clustering and PCA? | |
| 208 Solving for regression parameters in closed-form vs gradient descent | |
| 209 When to use regularization methods for regression? | |
| 210 Convergence in probability vs. almost sure convergence | |
| 211 If mean is so sensitive, why use it in the first place? | |
| 212 How to efficiently manage a statistical analysis project? | |
| 213 If I have a 58% chance of winning a point, whats the chance of me winning a ping pong game to 21, win by 2? | |
| 214 Is it necessary to scale the target value in addition to scaling features for regression analysis? | |
| 215 Mean absolute error OR root mean squared error? | |
| 216 How to apply Neural Network to time series forecasting? | |
| 217 Feature selection for final model when performing cross-validation in machine learning | |
| 218 The Book of Why by Judea Pearl: Why is he bashing statistics? | |
| 219 Given the power of computers these days, is there ever a reason to do a chi-squared test rather than Fishers exact test? | |
| 220 Relationship between poisson and exponential distribution | |
| 221 How to produce a pretty plot of the results of k-means cluster analysis? | |
| 222 Correlation between a nominal (IV) and a continuous (DV) variable | |
| 223 Does the variance of a sum equal the sum of the variances? | |
| 224 How does the reparameterization trick for VAEs work and why is it important? | |
| 225 Why to optimize max log probability instead of probability | |
| 226 What is meant by a random variable? | |
| 227 Are there any examples where Bayesian credible intervals are obviously inferior to frequentist confidence intervals | |
| 228 How to compute precision/recall for multiclass-multilabel classification? | |
| 229 What is the lasso in regression analysis? | |
| 230 What is the difference between Multiclass and Multilabel Problem | |
| 231 How to tell if data is clustered enough for clustering algorithms to produce meaningful results? | |
| 232 Principled way of collapsing categorical variables with many levels? | |
| 233 Rules of thumb for modern statistics | |
| 234 How to sum a standard deviation? | |
| 235 How does the correlation coefficient differ from regression slope? | |
| 236 How should outliers be dealt with in linear regression analysis? | |
| 237 Loadings vs eigenvectors in PCA: when to use one or another? | |
| 238 What do you call an average that does not include outliers? | |
| 239 How is it possible that validation loss is increasing while validation accuracy is increasing as well | |
| 240 Kendall Tau or Spearmans rho? | |
| 241 When to use an offset in a Poisson regression? | |
| 242 What is a complete list of the usual assumptions for linear regression? | |
| 243 What is an uninformative prior? Can we ever have one with truly no information? | |
| 244 What is the single most influential book every statistician should read? | |
| 245 Is there a minimum sample size required for the t-test to be valid? | |
| 246 Calculating the parameters of a Beta distribution using the mean and variance | |
| 247 Resampling / simulation methods: monte carlo, bootstrapping, jackknifing, cross-validation, randomization tests, and permutation tests | |
| 248 Euclidean distance is usually not good for sparse data (and more general case)? | |
| 249 What are principal component scores? | |
| 250 An example: LASSO regression using glmnet for binary outcome | |
| 251 How to plot ROC curves in multiclass classification? | |
| 252 When to use Fisher and Neyman-Pearson framework? | |
| 253 What are modern, easily used alternatives to stepwise regression? | |
| 254 Line of best fit does not look like a good fit. Why? | |
| 255 Why should I be Bayesian when my model is wrong? | |
| 256 Why havent robust (and resistant) statistics replaced classical techniques? | |
| 257 What is the meaning of All models are wrong, but some are useful | |
| 258 Cross-Validation in plain english? | |
| 259 Subscript notation in expectations | |
| 260 What correlation makes a matrix singular and what are implications of singularity or near-singularity? | |
| 261 What is restricted maximum likelihood and when should it be used? | |
| 262 What do the residuals in a logistic regression mean? | |
| 263 Why is it possible to get significant F statistic (p<.001) but non-significant regressor t-tests? | |
| 264 What is the difference between a link function and a canonical link function for GLM | |
| 265 What are the big problems in statistics? | |
| 266 Mathematician wants the equivalent knowledge to a quality stats degree | |
| 267 Examples for teaching: Correlation does not mean causation | |
| 268 Why does k-means clustering algorithm use only Euclidean distance metric? | |
| 269 Why is ridge regression called ridge, why is it needed, and what happens when $\lambda$ goes to infinity? | |
| 270 When (if ever) is a frequentist approach substantively better than a Bayesian? | |
| 271 How to interpret an inverse covariance or precision matrix? | |
| 272 When is unbalanced data really a problem in Machine Learning? | |
| 273 XKCDs modified Bayes theorem: actually kinda reasonable? | |
| 274 Regarding p-values, why 1% and 5%? Why not 6% or 10%? | |
| 275 Probability of a single real-life future event: What does it mean when they say that Hillary has a 75% chance of winning? | |
| 276 Best way to present a random forest in a publication? | |
| 277 Why is the L2 regularization equivalent to Gaussian prior? | |
| 278 Mutual information versus correlation | |
| 279 Please explain the waiting paradox | |
| 280 Help me understand Support Vector Machines | |
| 281 How to generate uniformly distributed points on the surface of the 3-d unit sphere? | |
| 282 Choosing a clustering method | |
| 283 Can bootstrap be seen as a cure for the small sample size? | |
| 284 What is regularization in plain english? | |
| 285 Whatre the differences between PCA and autoencoder? | |
| 286 What is the reason that a likelihood function is not a pdf? | |
| 287 How to visualize what canonical correlation analysis does (in comparison to what principal component analysis does)? | |
| 288 Likelihood ratio vs Bayes Factor | |
| 289 Skills hard to find in machine learners? | |
| 290 Is there a name for the phenomenon of false positives counterintuitively outstripping true positives | |
| 291 Rules of thumb for minimum sample size for multiple regression | |
| 292 Explain the difference between multiple regression and multivariate regression, with minimal use of symbols/math | |
| 293 What algorithm should I use to detect anomalies on time-series? | |
| 294 How to interpret coefficients in a Poisson regression? | |
| 295 What is the difference between R functions prcomp and princomp? | |
| 296 What is an ablation study? And is there a systematic way to perform it? | |
| 297 Free resources for learning R | |
| 298 On the importance of the i.i.d. assumption in statistical learning | |
| 299 What is a kernel in plain English? | |
| 300 Famous statistical wins and horror stories for teaching purposes | |
| 301 How to obtain the p-value (check significance) of an effect in a lme4 mixed model? | |
| 302 Why not approach classification through regression? | |
| 303 What are disadvantages of using the lasso for variable selection for regression? | |
| 304 Diagnostics for logistic regression? | |
| 305 Shape of confidence interval for predicted values in linear regression | |
| 306 Is there any good reason to use PCA instead of EFA? Also, can PCA be a substitute for factor analysis? | |
| 307 What is the best way to remember the difference between sensitivity, specificity, precision, accuracy, and recall? | |
| 308 Variable selection for predictive modeling really needed in 2016? | |
| 309 What are the major philosophical, methodological, and terminological differences between econometrics and other statistical fields? | |
| 310 How does a simple logistic regression model achieve a 92% classification accuracy on MNIST? | |
| 311 What is global max pooling layer and what is its advantage over maxpooling layer? | |
| 312 What is wrong with extrapolation? | |
| 313 How exactly did statisticians agree to using (n-1) as the unbiased estimator for population variance without simulation? | |
| 314 Bayes regression: how is it done in comparison to standard regression? | |
| 315 Does no correlation imply no causality? | |
| 316 Do not vote, one vote will not reverse election results. What is wrong with this reasoning? | |
| 317 Impractical question: is it possible to find the regression line using a ruler and compass? | |
| 318 How and why do normalization and feature scaling work? | |
| 319 What are good initial weights in a neural network? | |
| 320 Multivariate multiple regression in R | |
| 321 Why does including latitude and longitude in a GAM account for spatial autocorrelation? | |
| 322 Why do neural network researchers care about epochs? | |
| 323 Whats so moment about moments of a probability distribution? | |
| 324 How to split the dataset for cross validation, learning curve, and final evaluation? | |
| 325 Practical questions on tuning Random Forests | |
| 326 What is an intuitive explanation for how PCA turns from a geometric problem (with distances) to a linear algebra problem (with eigenvectors)? | |
| 327 What is the intuition behind SVD? | |
| 328 Model for predicting number of Youtube views of Gangnam Style | |
| 329 What are some of the most common misconceptions about linear regression? | |
| 330 Unified view on shrinkage: what is the relation (if any) between Steins paradox, ridge regression, and random effects in mixed models? | |
| 331 What is the difference between discrete data and continuous data? | |
| 332 What are good RMSE values? | |
| 333 Good GUI for R suitable for a beginner wanting to learn programming in R? | |
| 334 Where to cut a dendrogram? | |
| 335 When to use generalized estimating equations vs. mixed effects models? | |
| 336 Having a job in data-mining without a PhD | |
| 337 Practical thoughts on explanatory vs. predictive modeling | |
| 338 Complete substantive examples of reproducible research using R | |
| 339 What method can be used to detect seasonality in data? | |
| 340 Understanding ROC curve | |
| 341 What is the difference between ZCA whitening and PCA whitening? | |
| 342 Do all interactions terms need their individual terms in regression model? | |
| 343 What makes the Gaussian kernel so magical for PCA, and also in general? | |
| 344 How should tiny $p$-values be reported? (and why does R put a minimum on 2.22e-16?) | |
| 345 A psychology journal banned p-values and confidence intervals; is it indeed wise to stop using them? | |
| 346 Removing duplicated rows data frame in R | |
| 347 How to actually plot a sample tree from randomForest::getTree()? | |
| 348 Understanding stratified cross-validation | |
| 349 How to tune hyperparameters of xgboost trees? | |
| 350 Basic question about Fisher Information matrix and relationship to Hessian and standard errors | |
| 351 What are some valuable Statistical Analysis open source projects? | |
| 352 Is this the solution to the p-value problem? | |
| 353 Covariance and independence? | |
| 354 How to use Pearson correlation correctly with time series | |
| 355 One-hot vs dummy encoding in Scikit-learn | |
| 356 Proper way of using recurrent neural network for time series analysis | |
| 357 How can adding a 2nd IV make the 1st IV significant? | |
| 358 If A and B are correlated with C, why are A and B not necessarily correlated? | |
| 359 Optimization when Cost Function Slow to Evaluate | |
| 360 Is there any *mathematical* basis for the Bayesian vs frequentist debate? | |
| 361 Whats the difference between feed-forward and recurrent neural networks? | |
| 362 What are good basic statistics to use for ordinal data? | |
| 363 Do the predictions of a Random Forest model have a prediction interval? | |
| 364 Is PCA followed by a rotation (such as varimax) still PCA? | |
| 365 What is the relationship between independent component analysis and factor analysis? | |
| 366 What problem do shrinkage methods solve? | |
| 367 How to normalize data between -1 and 1? | |
| 368 What are i.i.d. random variables? | |
| 369 How can an artificial neural network ANN, be used for unsupervised clustering? | |
| 370 What is a saturated model? | |
| 371 When are Log scales appropriate? | |
| 372 ImageNet: what is top-1 and top-5 error rate? | |
| 373 How is the minimum of a set of IID random variables distributed? | |
| 374 Understanding the role of the discount factor in reinforcement learning | |
| 375 Whats the difference between momentum based gradient descent and Nesterovs accelerated gradient descent? | |
| 376 What is the difference between a neural network and a deep belief network? | |
| 377 Assumptions regarding bootstrap estimates of uncertainty | |
| 378 Look and you shall find (a correlation) | |
| 379 What is a good, convincing example in which p-values are useful? | |
| 380 Performance metrics to evaluate unsupervised learning | |
| 381 Hold-out validation vs. cross-validation | |
| 382 Statistics interview questions | |
| 383 Central limit theorem for sample medians | |
| 384 Intuition on the Kullback–Leibler (KL) Divergence | |
| 385 Taleb and the Black Swan | |
| 386 Where did the frequentist-Bayesian debate go? | |
| 387 How to interpret F-measure values? | |
| 388 How to simulate data that satisfy specific constraints such as having specific mean and standard deviation? | |
| 389 Using principal component analysis (PCA) for feature selection | |
| 390 Which pseudo-$R^2$ measure is the one to report for logistic regression (Cox & Snell or Nagelkerke)? | |
| 391 Why bother with the dual problem when fitting SVM? | |
| 392 Why is the Jeffreys prior useful? | |
| 393 Intuitive explanation of Fisher Information and Cramer-Rao bound | |
| 394 How to visualize what ANOVA does? | |
| 395 Is the R language reliable for the field of economics? | |
| 396 Standard errors for lasso prediction using R | |
| 397 How can I help ensure testing data does not leak into training data? | |
| 398 Why would parametric statistics ever be preferred over nonparametric? | |
| 399 40,000 neuroscience papers might be wrong | |
| 400 References containing arguments against null hypothesis significance testing? | |
| 401 How much to pay? A practical problem | |
| 402 Regression with multiple dependent variables? | |
| 403 Random Forest - How to handle overfitting | |
| 404 What does orthogonal mean in the context of statistics? | |
| 405 Why is sample standard deviation a biased estimator of $\sigma$? | |
| 406 KL divergence between two multivariate Gaussians | |
| 407 What is translation invariance in computer vision and convolutional neural network? | |
| 408 Why is multicollinearity not checked in modern statistics/machine learning | |
| 409 Variables are often adjusted (e.g. standardised) before making a model - when is this a good idea, and when is it a bad one? | |
| 410 What is the difference between a partial likelihood, profile likelihood and marginal likelihood? | |
| 411 Why is the square root transformation recommended for count data? | |
| 412 Real-life examples of moving average processes | |
| 413 Why do neural networks need so many training examples to perform? | |
| 414 Is this chart showing the likelihood of a terrorist attack statistically useful? | |
| 415 Maximum likelihood method vs. least squares method | |
| 416 Why is it that natural log changes are percentage changes? What is about logs that makes this so? | |
| 417 Why is logistic regression a linear classifier? | |
| 418 Why is ANOVA equivalent to linear regression? | |
| 419 Why only three partitions? (training, validation, test) | |
| 420 Why does ridge estimate become better than OLS by adding a constant to the diagonal? | |
| 421 What is the most surprising characterization of the Gaussian (normal) distribution? | |
| 422 Criticism of Pearls theory of causality | |
| 423 What is the difference between a nested and a non-nested model? | |
| 424 Why do we minimize the negative likelihood if it is equivalent to maximization of the likelihood? | |
| 425 Clustering with a distance matrix | |
| 426 Does it make sense to add a quadratic term but not the linear term to a model? | |
| 427 Derivation of closed form lasso solution | |
| 428 Reduce Classification Probability Threshold | |
| 429 Explain the xkcd jelly bean comic: What makes it funny? | |
| 430 Do we need a global test before post hoc tests? | |
| 431 How small a quantity should be added to x to avoid taking the log of zero? | |
| 432 Efficient online linear regression | |
| 433 Are bayesians slaves of the likelihood function? | |
| 434 Who created the first standard normal table? | |
| 435 List of situations where a Bayesian approach is simpler, more practical, or more convenient | |
| 436 Why does collecting data until finding a significant result increase Type I error rate? | |
| 437 Wald test for logistic regression | |
| 438 Test if two binomial distributions are statistically different from each other | |
| 439 What is the difference in Bayesian estimate and maximum likelihood estimate? | |
| 440 Perform feature normalization before or within model validation? | |
| 441 Is there a difference between controlling for and ignoring other variables in multiple regression? | |
| 442 If we fail to reject the null hypothesis in a large study, isnt it evidence for the null? | |
| 443 A more definitive discussion of variable selection | |
| 444 What are the worst (commonly adopted) ideas/principles in statistics? | |
| 445 How to statistically compare two time series? | |
| 446 What is the effect of having correlated predictors in a multiple regression model? | |
| 447 What is a contrast matrix? | |
| 448 Software needed to scrape data from graph | |
| 449 Examples of Bayesian and frequentist approach giving different answers | |
| 450 Machine learning cookbook / reference card / cheatsheet? | |
| 451 Brain teaser: How to generate 7 integers with equal probability using a biased coin that has a pr(head) = p? | |
| 452 What does Scientists rise up against statistical significance mean? (Comment in Nature) | |
| 453 Two-tailed tests... Im just not convinced. Whats the point? | |
| 454 Is the hybrid between Fisher and Neyman-Pearson approaches to statistical testing really an incoherent mishmash? | |
| 455 Interpreting Residual and Null Deviance in GLM R | |
| 456 Variance of product of multiple independent random variables | |
| 457 Is standardization needed before fitting logistic regression? | |
| 458 Under what conditions should Likert scales be used as ordinal or interval data? | |
| 459 Questions about how random effects are specified in lmer | |
| 460 Should I use a categorical cross-entropy or binary cross-entropy loss for binary predictions? | |
| 461 What is the difference between estimation and prediction? | |
| 462 How to generate correlated random numbers (given means, variances and degree of correlation)? | |
| 463 Does it ever make sense to treat categorical data as continuous? | |
| 464 Why is tanh almost always better than sigmoid as an activation function? | |
| 465 Which permutation test implementation in R to use instead of t-tests (paired and non-paired)? | |
| 466 Binary classification with strongly unbalanced classes | |
| 467 A generalization of the Law of Iterated Expectations | |
| 468 Period detection of a generic time series | |
| 469 What does the inverse of covariance matrix say about data? (Intuitively) | |
| 470 Advanced statistics books recommendation | |
| 471 What is so cool about de Finettis representation theorem? | |
| 472 Why is the regularization term *added* to the cost function (instead of multiplied etc.)? | |
| 473 Most famous statisticians | |
| 474 A chart of daily cases of COVID-19 in a Russian region looks suspiciously level to me - is this so from the statistics viewpoint? | |
| 475 Why is the validation accuracy fluctuating? | |
| 476 How do you calculate the probability density function of the maximum of a sample of IID uniform random variables? | |
| 477 How can I change the title of a legend in ggplot2? | |
| 478 Data normalization and standardization in neural networks | |
| 479 How does one interpret SVM feature weights? | |
| 480 What is the relationship between a chi squared test and test of equal proportions? | |
| 481 Why doesnt Random Forest handle missing values in predictors? | |
| 482 Does 10 heads in a row increase the chance of the next toss being a tail? | |
| 483 Difference between Random Forest and Extremely Randomized Trees | |
| 484 Is adjusting p-values in a multiple regression for multiple comparisons a good idea? | |
| 485 Is every covariance matrix positive definite? | |
| 486 Measuring entropy/ information/ patterns of a 2d binary matrix | |
| 487 Logistic regression in R resulted in perfect separation (Hauck-Donner phenomenon). Now what? | |
| 488 Optimal number of folds in $K$-fold cross-validation: is leave-one-out CV always the best choice? | |
| 489 How to derive variance-covariance matrix of coefficients in linear regression | |
| 490 Is it meaningful to calculate Pearson or Spearman correlation between two Boolean vectors? | |
| 491 How to calculate pseudo-$R^2$ from Rs logistic regression? | |
| 492 Is it important to scale data before clustering? | |
| 493 Comparing SVM and logistic regression | |
| 494 Are mean normalization and feature scaling needed for k-means clustering? | |
| 495 Why is expectation the same as the arithmetic mean? | |
| 496 Best practice when analysing pre-post treatment-control designs | |
| 497 What are the differences between epoch, batch, and minibatch? | |
| 498 Clustering with K-Means and EM: how are they related? | |
| 499 What is the variance of the weighted mixture of two gaussians? | |
| 500 What are the shortcomings of the Mean Absolute Percentage Error (MAPE)? | |
| 501 Are there cases where PCA is more suitable than t-SNE? | |
| 502 How do I test that two continuous variables are independent? | |
| 503 Choosing between LM and GLM for a log-transformed response variable | |
| 504 What are disadvantages of state-space models and Kalman Filter for time-series modelling? | |
| 505 Intuitive explanation of the bias-variance tradeoff? | |
| 506 Why does shrinkage work? | |
| 507 Examples where method of moments can beat maximum likelihood in small samples? | |
| 508 Are all values within a 95% confidence interval equally likely? | |
| 509 Industry vs Kaggle challenges. Is collecting more observations and having access to more variables more important than fancy modelling? | |
| 510 Correlations between continuous and categorical (nominal) variables | |
| 511 Manually Calculating P value from t-value in t-test | |
| 512 Which activation function for output layer? | |
| 513 Is chi-squared always a one-sided test? | |
| 514 Which loss function is correct for logistic regression? | |
| 515 What does standard deviation tell us in non-normal distribution | |
| 516 How should one interpret the comparison of means from different sample sizes? | |
| 517 Adam optimizer with exponential decay | |
| 518 Neural networks vs support vector machines: are the second definitely superior? | |
| 519 Recurrent vs Recursive Neural Networks: Which is better for NLP? | |
| 520 Linear model with log-transformed response vs. generalized linear model with log link | |
| 521 Box-Cox like transformation for independent variables? | |
| 522 Bootstrap vs. jackknife | |
| 523 Confidence interval for Bernoulli sampling | |
| 524 Introduction to statistics for mathematicians | |
| 525 Alternatives to logistic regression in R | |
| 526 What is the intuition behind conditional Gaussian distributions? | |
| 527 Resources for learning Markov chain and hidden Markov models | |
| 528 How exactly does a random effects model in econometrics relate to mixed models outside of econometrics? | |
| 529 Is ridge regression useless in high dimensions ($n \ll p$)? How can OLS fail to overfit? | |
| 530 Interview question: If correlation doesnt imply causation, how do you detect causation? | |
| 531 Why continue to teach and use hypothesis testing (when confidence intervals are available)? | |
| 532 What is the difference between N and N-1 in calculating population variance? | |
| 533 What does having constant variance in a linear regression model mean? | |
| 534 Testing equality of coefficients from two different regressions | |
| 535 Does the optimal number of trees in a random forest depend on the number of predictors? | |
| 536 How to decide on the correct number of clusters? | |
| 537 Difference between kernel and filter in CNN | |
| 538 R libraries for deep learning | |
| 539 How to interpret type I, type II, and type III ANOVA and MANOVA? | |
| 540 How can a distribution have infinite mean and variance? | |
| 541 What is the difference between a particle filter (sequential Monte Carlo) and a Kalman filter? | |
| 542 How to apply standardization/normalization to train- and testset if prediction is the goal? | |
| 543 What is the difference Cross-entropy and KL divergence? | |
| 544 Are residuals predicted minus actual or actual minus predicted | |
| 545 What is the objective function of PCA? | |
| 546 Is it wrong to rephrase 1 in 80 deaths is caused by a car accident as 1 in 80 people die as a result of a car accident? | |
| 547 Reference book for linear algebra applied to statistics? | |
| 548 How do R and Python complement each other in data science? | |
| 549 Statistics and causal inference? | |
| 550 What are the breakthroughs in Statistics of the past 15 years? | |
| 551 Are we exaggerating importance of model assumption and evaluation in an era when analyses are often carried out by laymen | |
| 552 ANOVA assumption normality/normal distribution of residuals | |
| 553 Mean absolute deviation vs. standard deviation | |
| 554 Warning in R - Chi-squared approximation may be incorrect | |
| 555 Standard error for the mean of a sample of binomial random variables | |
| 556 Regression when the OLS residuals are not normally distributed | |
| 557 How to determine best cutoff point and its confidence interval using ROC curve in R? | |
| 558 What is the difference between GARCH and ARMA? | |
| 559 Is random forest a boosting algorithm? | |
| 560 Using deep learning for time series prediction | |
| 561 How are regression, the t-test, and the ANOVA all versions of the general linear model? | |
| 562 What are alternatives of Gradient Descent? | |
| 563 Best PCA algorithm for huge number of features (>10K)? | |
| 564 Book for reading before Elements of Statistical Learning? | |
| 565 Why do Convolutional Neural Networks not use a Support Vector Machine to classify? | |
| 566 When combining p-values, why not just averaging? | |
| 567 What is the advantages of Wasserstein metric compared to Kullback-Leibler divergence? | |
| 568 Is sampling relevant in the time of big data? | |
| 569 Mathematical Statistics Videos | |
| 570 How do we decide when a small sample is statistically significant or not? | |
| 571 What are some examples of anachronistic practices in statistics? | |
| 572 Backpropagation with Softmax / Cross Entropy | |
| 573 Normalization vs. scaling | |
| 574 Effect of switching response and explanatory variable in simple linear regression | |
| 575 Graph for relationship between two ordinal variables | |
| 576 Training a decision tree against unbalanced data | |
| 577 A/B tests: z-test vs t-test vs chi square vs fisher exact test | |
| 578 What is a difference between random effects-, fixed effects- and marginal model? | |
| 579 Random forest computing time in R | |
| 580 Why sigmoid function instead of anything else? | |
| 581 Multivariate linear regression vs neural network? | |
| 582 Standard deviation of standard deviation | |
| 583 Practical hyperparameter optimization: Random vs. grid search | |
| 584 Is the COVID-19 pandemic curve a Gaussian curve? | |
| 585 Why on average does each bootstrap sample contain roughly two thirds of observations? | |
| 586 Can a random forest be used for feature selection in multiple linear regression? | |
| 587 How to tell the probability of failure if there were no failures? | |
| 588 Modern successor to Exploratory Data Analysis by Tukey? | |
| 589 Who are frequentists? | |
| 590 Do we have a problem of pity upvotes? | |
| 591 How to derive the ridge regression solution? | |
| 592 How large should the batch size be for stochastic gradient descent? | |
| 593 What is the difference between NaN and NA? | |
| 594 What is maxout in neural network? | |
| 595 How to identify a bimodal distribution? | |
| 596 Correct spelling (capitalization, italicization, hyphenation) of p-value? | |
| 597 Apply word embeddings to entire document, to get a feature vector | |
| 598 Pandas / Statsmodel / Scikit-learn | |
| 599 Prediction interval for lmer() mixed effects model in R | |
| 600 Recommended books on experiment design? | |
| 601 Should I normalize word2vecs word vectors before using them? | |
| 602 What is a good algorithm for estimating the median of a huge read-once data set? | |
| 603 What should I do when my neural network doesnt generalize well? | |
| 604 Is it possible to do time-series clustering based on curve shape? | |
| 605 Why do we use Kullback-Leibler divergence rather than cross entropy in the t-SNE objective function? | |
| 606 Data APIs/feeds available as packages in R | |
| 607 Intuitive explanations of differences between Gradient Boosting Trees (GBM) & Adaboost | |
| 608 Can someone explain the concept of exchangeability? | |
| 609 Is it true that the percentile bootstrap should never be used? | |
| 610 Machine Learning using Python | |
| 611 Why do we care so much about normally distributed error terms (and homoskedasticity) in linear regression when we dont have to? | |
| 612 Why are MA(q) time series models called moving averages? | |
| 613 Visually interesting statistics concepts that are easy to explain | |
| 614 Most confusing statistical terms | |
| 615 R - QQPlot: how to see whether data are normally distributed | |
| 616 Is it a good practice to always scale/normalize data for machine learning? | |
| 617 How to visualize a fitted multiple regression model? | |
| 618 Interpretation of log transformed predictor and/or response | |
| 619 Replicating Statas robust option in R | |
| 620 Obtaining predicted values (Y=1 or 0) from a logistic regression model fit | |
| 621 Why is the sum of two random variables a convolution? | |
| 622 F1/Dice-Score vs IoU | |
| 623 Multinomial logistic regression vs one-vs-rest binary logistic regression | |
| 624 Why downsample? | |
| 625 Software for drawing bayesian networks (graphical models) | |
| 626 Statistical inference when the sample is the population | |
| 627 Class imbalance in Supervised Machine Learning | |
| 628 What book is recommendable to start learning statistics using R at the same time? | |
| 629 Is there any gold standard for modeling irregularly spaced time series? | |
| 630 Interpreting QQplot - Is there any rule of thumb to decide for non-normality? | |
| 631 What are the main theorems in Machine (Deep) Learning? | |
| 632 Where does the misconception that Y must be normally distributed come from? | |
| 633 Intuition behind why Steins paradox only applies in dimensions $\ge 3$ | |
| 634 Why is a Bayesian not allowed to look at the residuals? | |
| 635 Excel as a statistics workbench | |
| 636 Are all models useless? Is any exact model possible -- or useful? | |
| 637 How to perform a test using R to see if data follows normal distribution | |
| 638 How to read Cooks distance plots? | |
| 639 Is there a test to determine whether GLM overdispersion is significant? | |
| 640 What is the difference between a Normal and a Gaussian Distribution | |
| 641 Linear kernel and non-linear kernel for support vector machine? | |
| 642 Is there any difference between lm and glm for the gaussian family of glm? | |
| 643 Cross-Entropy or Log Likelihood in Output layer | |
| 644 Wont highly-correlated variables in random forest distort accuracy and feature-selection? | |
| 645 Does anyone know any good open source software for visualizing data from database? | |
| 646 Cost function of neural network is non-convex? | |
| 647 Regression for an outcome (ratio or fraction) between 0 and 1 | |
| 648 How are propensity scores different from adding covariates in a regression, and when are they preferred to the latter? | |
| 649 How to select a clustering method? How to validate a cluster solution (to warrant the method choice)? | |
| 650 Why does the correlation coefficient between X and X-Y random variables tend to be 0.7 | |
| 651 Why do statisticians say a non-significant result means you cant reject the null as opposed to accepting the null hypothesis? | |
| 652 Fast linear regression robust to outliers | |
| 653 Consider the sum of $n$ uniform distributions on $[0,1]$, or $Z_n$. Why does the cusp in the PDF of $Z_n$ disappear for $n \geq 3$? | |
| 654 Famous easy to understand examples of a confounding variable invalidating a study | |
| 655 How are we defining reproducible research? | |
| 656 What is a good resource on table design? | |
| 657 Cumming (2008) claims that distribution of p-values obtained in replications depends only on the original p-value. How can it be true? | |
| 658 Relationship between $R^2$ and correlation coefficient | |
| 659 Logistic Regression: Scikit Learn vs Statsmodels | |
| 660 Using lmer for repeated-measures linear mixed-effect model | |
| 661 What is Deviance? (specifically in CART/rpart) | |
| 662 If the t-test and the ANOVA for two groups are equivalent, why arent their assumptions equivalent? | |
| 663 Neural Network: For Binary Classification use 1 or 2 output neurons? | |
| 664 Cross Entropy vs. Sparse Cross Entropy: When to use one over the other | |
| 665 How to simulate artificial data for logistic regression? | |
| 666 Regularization methods for logistic regression | |
| 667 What is the difference between the forward-backward and Viterbi algorithms? | |
| 668 Percentage of overlapping regions of two normal distributions | |
| 669 How to do logistic regression subset selection? | |
| 670 How do I find peaks in a dataset? | |
| 671 How does LSTM prevent the vanishing gradient problem? | |
| 672 What algorithm is used in linear regression? | |
| 673 Understanding almost all local minimum have very similar function value to the global optimum | |
| 674 Why do my p-values differ between logistic regression output, chi-squared test, and the confidence interval for the OR? | |
| 675 Understanding Naive Bayes | |
| 676 What is your favorite data visualization blog? | |
| 677 Statistical tests when sample size is 1 | |
| 678 Why is statistically significant not enough? | |
| 679 Why does frequentist hypothesis testing become biased towards rejecting the null hypothesis with sufficiently large samples? | |
| 680 A smaller dataset is better: Is this statement false in statistics? How to refute it properly? | |
| 681 Different ways to write interaction terms in lm? | |
| 682 Find expected value using CDF | |
| 683 What is the proper usage of scale_pos_weight in xgboost for imbalanced datasets? | |
| 684 Choosing the right linkage method for hierarchical clustering | |
| 685 Is a sample covariance matrix always symmetric and positive definite? | |
| 686 Difference between GradientDescentOptimizer and AdamOptimizer (TensorFlow)? | |
| 687 CNN architectures for regression? | |
| 688 Rule of thumb for number of bootstrap samples | |
| 689 Logistic Regression - Error Term and its Distribution | |
| 690 What is perplexity? | |
| 691 Normality of dependent variable = normality of residuals? | |
| 692 Is minimizing squared error equivalent to minimizing absolute error? Why squared error is more popular than the latter? | |
| 693 Survival Analysis tools in Python | |
| 694 Random forest assumptions | |
| 695 Which has the heavier tail, lognormal or gamma? | |
| 696 Are splines overfitting the data? | |
| 697 Motivation for Kolmogorov distance between distributions | |
| 698 How to determine whether or not the y-axis of a graph should start at zero? | |
| 699 Is Amazons average rating misleading? | |
| 700 Clarification on interpreting confidence intervals? | |
| 701 Does correlation = 0.2 mean that there is an association in only 1 in 5 people? | |
| 702 Eliciting priors from experts | |
| 703 AIC,BIC,CIC,DIC,EIC,FIC,GIC,HIC,IIC --- Can I use them interchangeably? | |
| 704 Logistic Regression in R (Odds Ratio) | |
| 705 Logistic regression model does not converge | |
| 706 How do I avoid overlapping labels in an R plot? | |
| 707 What is difference-in-differences? | |
| 708 Why would R return NA as a lm() coefficient? | |
| 709 Derive Variance of regression coefficient in simple linear regression | |
| 710 Why is median age a better statistic than mean age? | |
| 711 Clustering a long list of strings (words) into similarity groups | |
| 712 Suppression effect in regression: definition and visual explanation/depiction | |
| 713 How to interpret error measures? | |
| 714 What is the definition of a feature map (aka activation map) in a convolutional neural network? | |
| 715 Dynamic Time Warping Clustering | |
| 716 Regression: Transforming Variables | |
| 717 How does the Adam method of stochastic gradient descent work? | |
| 718 When conducting a t-test why would one prefer to assume (or test for) equal variances rather than always use a Welch approximation of the df? | |
| 719 How does centering the data get rid of the intercept in regression and PCA? | |
| 720 Can machine learning decode the SHA256 hashes? | |
| 721 How are kernels applied to feature maps to produce other feature maps? | |
| 722 What is the distribution of the Euclidean distance between two normally distributed random variables? | |
| 723 Do we have to tune the number of trees in a random forest? | |
| 724 Kullback–Leibler vs Kolmogorov-Smirnov distance | |
| 725 Empirical justification for the one standard error rule when using cross-validation | |
| 726 What can we say about population mean from a sample size of 1? | |
| 727 How can I calculate $\int^{\infty}_{-\infty}\Phi\left(\frac{w-a}{b}\right)\phi(w)\,\mathrm dw$ | |
| 728 Is it possible to interpret the bootstrap from a Bayesian perspective? | |
| 729 Pitfalls in time series analysis | |
| 730 Where to start with statistics for an experienced developer | |
| 731 Can simple linear regression be done without using plots and linear algebra? | |
| 732 First R packages source code to study in preparation for writing own package | |
| 733 What is residual standard error? | |
| 734 What do endogeneity and exogeneity mean substantively? | |
| 735 How to interpret Mean Decrease in Accuracy and Mean Decrease GINI in Random Forest models | |
| 736 Why do we use ReLU in neural networks and how do we use it? | |
| 737 Logistic regression: anova chi-square test vs. significance of coefficients (anova() vs summary() in R) | |
| 738 Rank in R - descending order | |
| 739 How do I test a nonlinear association? | |
| 740 Online vs offline learning? | |
| 741 Expected number of ratio of girls vs boys birth | |
| 742 Best method for short time-series | |
| 743 How to interpret coefficients from a polynomial model fit? | |
| 744 What is the distribution of the sum of non i.i.d. gaussian variates? | |
| 745 What is the difference between prediction and inference? | |
| 746 Why zero correlation does not necessarily imply independence | |
| 747 Does the sign of scores or of loadings in PCA or FA have a meaning? May I reverse the sign? | |
| 748 How does rectilinear activation function solve the vanishing gradient problem in neural networks? | |
| 749 PCA and the train/test split | |
| 750 Bootstrap vs. permutation hypothesis testing | |
| 751 Features for time series classification | |
| 752 What is the difference between posterior and posterior predictive distribution? | |
| 753 Why is polynomial regression considered a special case of multiple linear regression? | |
| 754 Generic sum of Gamma random variables | |
| 755 Optimized implementations of the Random Forest algorithm | |
| 756 What are the cons of Bayesian analysis? | |
| 757 Is it unusual for the MEAN to outperform ARIMA? | |
| 758 Where does $\sqrt{n}$ come from in central limit theorem (CLT)? | |
| 759 How does saddlepoint approximation work? | |
| 760 Bayesian statistics tutorial | |
| 761 Why would someone use a Bayesian approach with a noninformative improper prior instead of the classical approach? | |
| 762 Choosing variables to include in a multiple linear regression model | |
| 763 Interpretation of Rs output for binomial regression | |
| 764 What references should be cited to support using 30 as a large enough sample size? | |
| 765 Using R online - without installing it | |
| 766 Difference between forecast and prediction? | |
| 767 SVM, Overfitting, curse of dimensionality | |
| 768 How to make a time series stationary? | |
| 769 Why does correlation matrix need to be positive semi-definite and what does it mean to be or not to be positive semi-definite? | |
| 770 How does centering make a difference in PCA (for SVD and eigen decomposition)? | |
| 771 Prediction in Cox regression | |
| 772 Importance of local response normalization in CNN | |
| 773 Alternatives to one-way ANOVA for heteroskedastic data | |
| 774 Understanding LSTM units vs. cells | |
| 775 Neural Networks: weight change momentum and weight decay | |
| 776 Probability distribution for different probabilities | |
| 777 Are there any good movies involving mathematics or probability? | |
| 778 Bayesian equivalent of two sample t-test? | |
| 779 Empirical relationship between mean, median and mode | |
| 780 Statistical models cheat sheet | |
| 781 Confidence interval around binomial estimate of 0 or 1 | |
| 782 Taking the expectation of Taylor series (especially the remainder) | |
| 783 Does the reciprocal of a probability represent anything? | |
| 784 Why do people use p-values instead of computing probability of the model given data? | |
| 785 Are CDFs more fundamental than PDFs? | |
| 786 What is the root cause of the class imbalance problem? | |
| 787 How well can multiple regression really control for covariates? | |
| 788 Understanding regressions - the role of the model | |
| 789 How to interpret and report eta squared / partial eta squared in statistically significant and non-significant analyses? | |
| 790 What are the values p, d, q, in ARIMA? | |
| 791 Negative values for AIC in General Mixed Model | |
| 792 How to interpret mean of Silhouette plot? | |
| 793 What is quasi-binomial distribution (in the context of GLM)? | |
| 794 Would PCA work for boolean (binary) data types? | |
| 795 Logistic regression vs. LDA as two-class classifiers | |
| 796 Danger of setting all initial weights to zero in Backpropagation | |
| 797 Why is there a difference between manually calculating a logistic regression 95% confidence interval, and using the confint() function in R? | |
| 798 Poisson regression to estimate relative risk for binary outcomes | |
| 799 How to do community detection in a weighted social network/graph? | |
| 800 How is softmax_cross_entropy_with_logits different from softmax_cross_entropy_with_logits_v2? | |
| 801 Is regression with L1 regularization the same as Lasso, and with L2 regularization the same as ridge regression? And how to write Lasso? | |
| 802 Approximate order statistics for normal random variables | |
| 803 Why is softmax output not a good uncertainty measure for Deep Learning models? | |
| 804 When is a biased estimator preferable to unbiased one? | |
| 805 Deriving Bellmans Equation in Reinforcement Learning | |
| 806 What exactly is Big Data? | |
| 807 Rigorous definition of an outlier? | |
| 808 Variational inference versus MCMC: when to choose one over the other? | |
| 809 Why dont linear regression assumptions matter in machine learning? | |
| 810 Computing Cohens Kappa variance (and standard errors) | |
| 811 Why is multiple comparison a problem? | |
| 812 How to plot trends properly | |
| 813 Compendium of cross-validation techniques | |
| 814 How seriously should I think about the different philosophies of statistics? | |
| 815 Debunking wrong CLT statement | |
| 816 Reviewing statistics in papers | |
| 817 How to interpret F- and p-value in ANOVA? | |
| 818 How to interpret the output of the summary method for an lm object in R? | |
| 819 Using LASSO from lars (or glmnet) package in R for variable selection | |
| 820 Lift measure in data mining | |
| 821 How to assess the similarity of two histograms? | |
| 822 PP-plots vs. QQ-plots | |
| 823 Measures of variable importance in random forests | |
| 824 How can I test if given samples are taken from a Poisson distribution? | |
| 825 Is it valid to include a baseline measure as control variable when testing the effect of an independent variable on change scores? | |
| 826 What are the differences between hidden Markov models and neural networks? | |
| 827 Tiny (real) datasets for giving examples in class? | |
| 828 Bayesian vs frequentist Interpretations of Probability | |
| 829 Intuitive difference between hidden Markov models and conditional random fields | |
| 830 Why does inversion of a covariance matrix yield partial correlations between random variables? | |
| 831 What is the difference between Metropolis-Hastings, Gibbs, Importance, and Rejection sampling? | |
| 832 What is the difference between a loss function and an error function? | |
| 833 Is machine learning less useful for understanding causality, thus less interesting for social science? | |
| 834 OpenBugs vs. JAGS | |
| 835 When to use simulations? | |
| 836 Would a Bayesian admit that there is one fixed parameter value? | |
| 837 Intuitive explanation for density of transformed variable? | |
| 838 What is your favorite statistical graph? | |
| 839 Statistics published in academic papers | |
| 840 Why does increasing the sample size lower the (sampling) variance? | |
| 841 What is the reason why we use natural logarithm (ln) rather than log to base 10 in specifying function in econometrics? | |
| 842 Mean absolute percentage error (MAPE) in Scikit-learn | |
| 843 How to interpret p-value of Kolmogorov-Smirnov test (python)? | |
| 844 Negative values for AICc (corrected Akaike Information Criterion) | |
| 845 what does the numbers in the classification report of sklearn mean? | |
| 846 Softmax layer in a neural network | |
| 847 What is the significance of logistic regression coefficients? | |
| 848 What is the adjusted R-squared formula in lm in R and how should it be interpreted? | |
| 849 Should covariates that are not statistically significant be kept in when creating a model? | |
| 850 What is meant by weak learner? | |
| 851 Explanation of min_child_weight in xgboost algorithm | |
| 852 When will L1 regularization work better than L2 and vice versa? | |
| 853 Why does Andrew Ng prefer to use SVD and not EIG of covariance matrix to do PCA? | |
| 854 LDA vs word2vec | |
| 855 What is the difference between conditional and unconditional quantile regression? | |
| 856 PCA and Correspondence analysis in their relation to Biplot | |
| 857 Who invented stochastic gradient descent? | |
| 858 Were generative adversarial networks introduced by Jürgen Schmidhuber? | |
| 859 What is the purpose of characteristic functions? | |
| 860 Why are regression problems called regression problems? | |
| 861 Why do we only see $L_1$ and $L_2$ regularization but not other norms? | |
| 862 Neural network references (textbooks, online courses) for beginners | |
| 863 When teaching statistics, use normal or Gaussian? | |
| 864 Fake uniform random numbers: More evenly distributed than true uniform data | |
| 865 How do I get people to take better care of data? | |
| 866 What is the difference between a population and a sample? | |
| 867 Random number-Set.seed(N) in R | |
| 868 AIC guidelines in model selection | |
| 869 Interpreting the residuals vs. fitted values plot for verifying the assumptions of a linear model | |
| 870 Comparing two models using anova() function in R | |
| 871 Difference between naive Bayes & multinomial naive Bayes | |
| 872 How to calculate relative error when the true value is zero? | |
| 873 How to interpret glmnet? | |
| 874 How to quasi match two vectors of strings (in R)? | |
| 875 R - Confused on Residual Terminology | |
| 876 Multiple regression or partial correlation coefficient? And relations between the two | |
| 877 Determining sample size necessary for bootstrap method / Proposed Method | |
| 878 How to choose between ROC AUC and F1 score? | |
| 879 When and how to use standardized explanatory variables in linear regression | |
| 880 When should I balance classes in a training data set? | |
| 881 Relative variable importance for Boosting | |
| 882 Are pooling layers added before or after dropout layers? | |
| 883 Hierarchical clustering with mixed type data - what distance/similarity to use? | |
| 884 What are best practices in identifying interaction effects? | |
| 885 Confidence interval for median | |
| 886 How trustworthy are the confidence intervals for lmer objects through effects package? | |
| 887 Why do I get a 100% accuracy decision tree? | |
| 888 Understanding the parameters inside the Negative Binomial Distribution | |
| 889 Gamma vs. lognormal distributions | |
| 890 Time series clustering in R | |
| 891 Are your chances of dying in a plane crash reduced if you fly direct? | |
| 892 How often do you have to roll a 6-sided die to obtain every number at least once? | |
| 893 Does the beta distribution have a conjugate prior? | |
| 894 whether to rescale indicator / binary / dummy predictors for LASSO | |
| 895 Differences between Bhattacharyya distance and KL divergence | |
| 896 How to efficiently generate random positive-semidefinite correlation matrices? | |
| 897 Correlation does not imply causation; but what about when one of the variables is time? | |
| 898 The Monty Hall Problem - where does our intuition fail us? | |
| 899 How do DAGs help to reduce bias in causal inference? | |
| 900 How to calculate a confidence level for a Poisson distribution? | |
| 901 How to interpret OOB and confusion matrix for random forest? | |
| 902 Statistical test to tell whether two samples are pulled from the same population? | |
| 903 Improve classification with many categorical variables | |
| 904 How to sample from a normal distribution with known mean and variance using a conventional programming language? | |
| 905 How can I test whether a random effect is significant? | |
| 906 Test for bimodal distribution | |
| 907 Dice-coefficient loss function vs cross-entropy | |
| 908 How do you use the test dataset after cross-validation? | |
| 909 What is the difference between finite and infinite variance | |
| 910 How to present results of a Lasso using glmnet? | |
| 911 K-fold vs. Monte Carlo cross-validation | |
| 912 What is the difference between coefficient of determination and mean squared error? | |
| 913 How are Random Forests not sensitive to outliers? | |
| 914 how to weight KLD loss vs reconstruction loss in variational auto-encoder | |
| 915 Gradient Boosting for Linear Regression - why does it not work? | |
| 916 What does the term saturating nonlinearities mean? | |
| 917 What is model identifiability? | |
| 918 Manually calculated $R^2$ doesnt match up with randomForest() $R^2$ for testing new data | |
| 919 What are posterior predictive checks and what makes them useful? | |
| 920 Approximate $e$ using Monte Carlo Simulation | |
| 921 Why is 600 out of 1000 more convincing than 6 out of 10? | |
| 922 References for survival analysis | |
| 923 Interpretation of p-value in hypothesis testing | |
| 924 How to determine significant principal components using bootstrapping or Monte Carlo approach? | |
| 925 Are there any good popular science book about statistics or machine learning? | |
| 926 Is LSTM (Long Short-Term Memory) dead? | |
| 927 Does statistical independence mean lack of causation? | |
| 928 Good games for learning statistical thinking? | |
| 929 Evidence for man-made global warming hits gold standard: how did they do this? | |
| 930 What is the relationship between the mean squared error and the residual sum of squares function? | |
| 931 How to perform two-sample t-tests in R by inputting sample statistics rather than the raw data? | |
| 932 Mixed Effects Model with Nesting | |
| 933 How does linear regression use the normal distribution? | |
| 934 Variance of product of dependent variables | |
| 935 What exactly is a Bayesian model? | |
| 936 Area under Precision-Recall Curve (AUC of PR-curve) and Average Precision (AP) | |
| 937 Detecting Outliers in Time Series (LS/AO/TC) using tsoutliers package in R. How to represent outliers in equation format? | |
| 938 How do I fit a constrained regression in R so that coefficients total = 1? | |
| 939 What exactly is the alpha in the Dirichlet distribution? | |
| 940 Purpose of the link function in generalized linear model | |
| 941 What is the meaning of a confidence interval taken from bootstrapped resamples? | |
| 942 Why do naive Bayesian classifiers perform so well? | |
| 943 How to find a good fit for semi-sinusoidal model in R? | |
| 944 Ridge, lasso and elastic net | |
| 945 How do you do bootstrapping with time series data? | |
| 946 How to test hypothesis of no group differences? | |
| 947 Why do we need multivariate regression (as opposed to a bunch of univariate regressions)? | |
| 948 Simulation of logistic regression power analysis - designed experiments | |
| 949 Was mathematics invented or discovered? | |
| 950 Is guns dont kill people, people kill people a good argument? | |
| 951 Why dont fair coin tosses add up? Or... is gamblers fallacy really valid? | |
| 952 Am I morally obligated to pursue a career in medicine? | |
| 953 What logical fallacy is If you dont like it, move!? | |
| 954 How does one know one is not dreaming? | |
| 955 What would it take in a book to convince a rational person that it had been written by or directly inspired by a god? | |
| 956 Could cogito ergo sum possibly be false? | |
| 957 Is Kurt Gödels Incompleteness Theorem a cheap trick? | |
| 958 Is it immoral to download music illegally? | |
| 959 Can you prove anything in philosophy? | |
| 960 How can an uneducated but rational person differentiate between science and religion? | |
| 961 Logical fallacy: X is bad, Y is worse, thus X is not bad | |
| 962 Why is there something instead of nothing? | |
| 963 Why is faith seen as a sign of weakness, instead of an unexplored land/opportunity? | |
| 964 Does human life have innate value over that of other animals? | |
| 965 Is the omniscient-omnipotent-omnipresent definition of God consistent? | |
| 966 In which way does quantum mechanics disprove determinism? | |
| 967 How will learning about philosophy impact real-life? | |
| 968 What is the difference between metaphysics and ontology? | |
| 969 Why is a lion not evil? | |
| 970 Why does the universe obey scientific laws? | |
| 971 Why arent creationism and natural science on the same intellectual level? | |
| 972 Why do they say I am committing a fallacy when I am just insulting someone? | |
| 973 How can one not believe in god as the root cause of the universe? | |
| 974 Why is Ayn Rands Objectivism philosophy dismissed by academics? | |
| 975 Does Pascals Wager contain any logical flaws or fallacies? | |
| 976 What is the moral difference between abortion and infanticide? | |
| 977 Is there an alternative to the scientific method? | |
| 978 What are the major branches of philosophy? | |
| 979 Why do I accept some inconsequential claims as obviously true without evidence? E.g. Most people dont like to be hit on the head with a hammer. | |
| 980 Is Mathematics always correct? | |
| 981 What are the ethical problems with flipping a coin to decide in the trolley problem? | |
| 982 Do numbers exist independently from observers? | |
| 983 Did Russell understand Gödels incompleteness theorems? | |
| 984 Is there a term for the belief that if its legal, its moral? | |
| 985 What basis do we have for certainty in current scientific theories? | |
| 986 Does a negative claimant have a burden of proof? | |
| 987 What fallacy in Pascals Wager allows replacing God with the devil? | |
| 988 What is the difference between free-will and randomness and or non-determinism? | |
| 989 How to get started with philosophy without getting overwhelmed quickly? | |
| 990 What did David Hume mean when he said that reason is a slave to the passions? | |
| 991 What are the ethics of having children today? | |
| 992 Fallacy by Sherlock Holmes Eliminate the impossible, and what remains must be the truth | |
| 993 What should philosophers know about math and natural sciences? | |
| 994 Is circular reasoning always a fallacy? | |
| 995 Is faith necessary for man to survive / why is existentialism valued if it is unsubstantiated? | |
| 996 How can one rebut the argument that atheism is inherently immoral? | |
| 997 What are the necessary conditions for an action to be regarded as a free choice? | |
| 998 Does happiness motivate every action? | |
| 999 How come nihilism is so popular today? | |
| 1000 Should I respect other peoples religions? | |
| 1001 Is it a fallacy, and if so which, to believe we are special because our existence on Earth seems improbable? | |
| 1002 Why do atheist euthanasia proponents consider nothingness preferable to suffering? | |
| 1003 Is it a fallacy if someone claims they need an explanation for every word of your argument to the point where they dont understand common terms? | |
| 1004 Why doesnt philosophy have higher standards for its arguments? | |
| 1005 Asserting that Atheism and Theism are both faith based positions | |
| 1006 Fundamental idea on proving Gods existence with science | |
| 1007 Why has the philosophy of Bishop Berkeley fallen out of favor in academic philosophy? | |
| 1008 How can one differentiate nonexistent entities? | |
| 1009 What should a rational person accept as a miracle? | |
| 1010 Was Socrates a fictional character invented by Plato? | |
| 1011 What would Kant do when two categorical imperatives conflict? Could he ever justify lying? | |
| 1012 What is the difference (if any) between not true and false? | |
| 1013 If I said I had $100 when asked, but I actually had $200, would I be lying by omission? | |
| 1014 Why are believers criticized so much for being anti-science when so many scientists are ... believers? | |
| 1015 Why is scientism philosophically wrong? | |
| 1016 Why do some people care so much about empirical truth? | |
| 1017 Why is the complex number an integral part of physical reality? | |
| 1018 Three statements that contradict each other | |
| 1019 What is the purpose of the universe? | |
| 1020 Where and how can I get started in contemporary philosophy? | |
| 1021 In what sense is atheism scientific? | |
| 1022 How did first-order logic come to be the dominant formal logic? | |
| 1023 Is there anything that is totally random? | |
| 1024 What are some good introductions to philosophy? | |
| 1025 Is atheism just another form of dogma? | |
| 1026 How does mathematics work? | |
| 1027 How is Gödels incompleteness theorem interpreted in intuitionistic logic? | |
| 1028 Does humanisms rejection of God necesitate relativism? | |
| 1029 What are the philosophical implications of Gödels First Incompleteness Theorem? | |
| 1030 To what extent do we choose our beliefs? | |
| 1031 Is First Order Logic (FOL) the only fundamental logic? | |
| 1032 Are Methodological Assumptions of StackExchange Fundamentally Flawed? | |
| 1033 What is the difference between Fact and Truth? | |
| 1034 Do fundamental concepts in physics have any logical basis? | |
| 1035 Why should I read about philosophy? | |
| 1036 What does it mean for a book or a theorist to be post-modernist as opposed to modernist? | |
| 1037 Are we living in a simulation? The evidence | |
| 1038 Since words are defined in terms of other words in dictionaries, leading to infinite loops, does it mean natural languages are meaningless? | |
| 1039 Does the no true Scotsman fallacy apply to anti Stalinist etc. communism? | |
| 1040 Is I cannot imagine a mechanism for X to happen, so X can never happen a named logical fallacy? | |
| 1041 What are/were the main criticisms of logical positivism? | |
| 1042 Was Robin Hoods point of view ethically sound? | |
| 1043 When is absence of evidence not evidence of absence? | |
| 1044 Is it possible for something to have no cause? | |
| 1045 Why does Dawkins think it is wrong to posit that a paragon of 100% morals could theoretically exist? | |
| 1046 Where is the weakness in the ontological proof for Gods existence? | |
| 1047 Being alive today: the most improbable coincidence? | |
| 1048 If the Bible contains circular reasoning, does it discredit it? | |
| 1049 Does hypocrisy invalidate an argument? | |
| 1050 Isnt the notion that everything will occur in an infinite timeline an example of the gamblers fallacy? | |
| 1051 Im being drafted to the military but I have the option to refuse (legally), would it be immoral for me to serve? | |
| 1052 What arguments would support a secular pro-life position? | |
| 1053 What are the major research programmes in contemporary logic? | |
| 1054 What are some arguments against violence? | |
| 1055 Isnt the existence of Hell inherently evil, and isnt God therefore evil in allowing Hell to exist? | |
| 1056 How can one argue against income inequality while defending achievement and expertise inequality - beyond invoking Rawls difference principle? | |
| 1057 Can time exist without change? | |
| 1058 Does the lack of randomness imply the lack of free will? | |
| 1059 Have professional philosophers contributed to other fields in the last 20 years? | |
| 1060 Why is Aristotles objection not considered a resolution to Zenos paradox? | |
| 1061 In what way(s) does popular New Atheism fail to be philosophical? | |
| 1062 Is the claim this coin is fair falsifiable? | |
| 1063 What are some works that apply an axiomatic method to something other than mathematics? | |
| 1064 What is the difference between a statement and a proposition? | |
| 1065 Is infinite regress of causation possible? Is infinite regress of causation necessary? | |
| 1066 What is modal logic for? | |
| 1067 What are the philosophical implications of category theory? | |
| 1068 Is mathematics founded on beliefs and assumptions? | |
| 1069 What is Philosophy? | |
| 1070 Are people capable of generating a random number? | |
| 1071 Whats so fallacious about the Slippery Slope Fallacy? | |
| 1072 Are there any philosophical arguments to disprove or weaken solipsism? | |
| 1073 Why do color TVs make black and white snow? | |
| 1074 Why do glass windows still exist? (Why havent they been replaced by plastics?) | |
| 1075 Why is kVA not the same as kW? | |
| 1076 Why do cars have mirrors for rear view rather than cameras? | |
| 1077 Are toasters really electrified inside of the slots? | |
| 1078 How was Volkswagen able to trick the lab pollution test? | |
| 1079 My customer wants to use my products to do something unsafe. What is my ethical obligation? | |
| 1080 Is it possible for a bicycle chainwheel to have a fractional number of teeth? | |
| 1081 Transmitting power over long distances what is better AC or DC? | |
| 1082 What is the purpose of these diversions in a natural gas line? | |
| 1083 Is it possible to build a perfectly spherical Prince Ruperts drop? | |
| 1084 What is the purpose of these “partially filled in” locomotive wheels? | |
| 1085 How fast does solid waste fall in vertical drain pipes? | |
| 1086 Why dig out and then fill in before building a large structure? | |
| 1087 Is it possible to pump a powder? | |
| 1088 What are the pros and cons of a traffic circle versus a traffic light intersection? | |
| 1089 Why are railroad tank cars bent in the middle? | |
| 1090 Is it possible to build an air compressor with no moving parts? | |
| 1091 How to quantify martial arts strikes? | |
| 1092 Why do hydraulic systems use special fluid - whats wrong with water? | |
| 1093 Which is Worse: Car vs. Car or Car vs. Wall? | |
| 1094 How can a piece of paper be shaped to guarantee it falls slower than a plain sheet of paper? | |
| 1095 Calculating pitch, yaw, and roll from mag, acc, and gyro data | |
| 1096 Why are engine blocks so robust apart from containing high pressure? | |
| 1097 How are increasingly accurate machines made? | |
| 1098 From an engineering point of view what are the downsides of a too accurate model? | |
| 1099 Why would you launch a large ship by dropping it sideways? | |
| 1100 Understanding required torque for a motor lifting a weight | |
| 1101 Why use steam instead of just hot air? | |
| 1102 Why are rear wheels not placed at the extreme rear of a bus? | |
| 1103 Why doesnt a lightning strike destroy the lightning rod? | |
| 1104 Why dont hydroelectric plants use cascades of turbines instead of single turbines? | |
| 1105 What is the purpose of these steps in rivers? | |
| 1106 Why exactly does a washer help distribute the stress around a bolt? | |
| 1107 Why do car wheels have holes? | |
| 1108 What is a reason that handlebars fit to a motorcycle and steering wheel fit to a car? | |
| 1109 How to know whether the flow is supersonic in a nozzle? | |
| 1110 Why not put servers in a refrigerator? | |
| 1111 How do engineers really use numerical simulation? | |
| 1112 How much can Protactinium degrade the efficiency of the Thorium fuel cycle? | |
| 1113 How does width and thickness affect the stiffness of steel plate? | |
| 1114 Would it make sense to have a 12V lighting circuit in a house? | |
| 1115 How to make smoke for a small wind tunnel? | |
| 1116 Why does it take so long to restart a nuclear power plant? | |
| 1117 Why would a train automatically derail if a signal is passed at danger? | |
| 1118 Why did steam locomotives not transfer power by cogwheels? | |
| 1119 What makes suspension bridges unsuitable for railways? | |
| 1120 Why do cars turn by turning the front wheel? | |
| 1121 Does a roadway bridge experience more load when vehicles are parked or when they are moving? | |
| 1122 How does turning off electric appliances save energy | |
| 1123 Why are earthfills fully covered in concrete where they join bridges? | |
| 1124 Why does the Channel Tunnel enter the ground around 10 km from the coast? | |
| 1125 Sizing a pressure safety valve for two-phase flow | |
| 1126 Whats wrong with transporting a refrigerator on its side? | |
| 1127 How to stop water flow in a siphon? | |
| 1128 Windmills in empty fields. Why no trees? | |
| 1129 What is the purpose of building foundations? | |
| 1130 Why are truss bridges the way they are? | |
| 1131 How does a traffic light sense the proximity of vehicles? | |
| 1132 What are the engineering principles for a train to get electricity from the railway | |
| 1133 Is it structurally sound to cut an I beam to a T on one end? | |
| 1134 What are the major differences between Engineering degrees and Engineering Technology degrees in terms of employability? | |
| 1135 Pound-force (lbf) vs Pound-mass (lbm) | |
| 1136 Effective ways to drive a single shaft with multiple motors? | |
| 1137 What material is used to hold molten iron in a furnace? | |
| 1138 What is the most efficient means of warming a building with a high ceiling? | |
| 1139 Why does the microwave plate start in a random direction? | |
| 1140 Why do oil tankers heat crude oil? | |
| 1141 Why dont refrigerators have parts outdoors? | |
| 1142 How does measurement uncertainty combine with tolerances? | |
| 1143 How many train passes can railway tracks endure? | |
| 1144 How can I measure correctly with a ruler? | |
| 1145 Why doesnt epoxy stick to silicone? | |
| 1146 How are passive houses made in very hot regions (like Saudi Arabia)? | |
| 1147 How to design a house to be cooled passively? | |
| 1148 Fracture patterns in tempered glass | |
| 1149 Meshing of complex geometrical domains | |
| 1150 How can a storm drop 40 inches (1 metre) of rain? | |
| 1151 Impossible or improbable? Hurricane crossing the equator | |
| 1152 What place on Earth is closest to the Sun? | |
| 1153 Are there any saltwater rivers on Earth? | |
| 1154 Why does lightning strike from the ground-up? | |
| 1155 How many trees would I have to plant to solve Global Warming? | |
| 1156 How much oil is created each year? | |
| 1157 What started the US Dust Bowl of the 1930s, and could it happen again? | |
| 1158 Why is the pond in my backyard not frozen when it is -15 °C (5 °F) outside? | |
| 1159 How do greenhouse gases let heat in, but not let it out? | |
| 1160 Why do snowflakes form into hexagonal structures? | |
| 1161 Are Richter-magnitude 10 earthquakes possible? | |
| 1162 (How long) would Earths atmosphere last without a global magnetic field? | |
| 1163 Farthest point from the center of the Earth | |
| 1164 Are there any uncharted waters left on earth? | |
| 1165 How is the mass of the Earth determined? | |
| 1166 How its possible to measure temperature 2000 years ago with such precision? | |
| 1167 What would be the temperature of earth if there was no atmosphere? | |
| 1168 CO₂ level is high enough that it reduces cognitive ability. Isnt that a reason to worry? | |
| 1169 What does a mm of rain mean? | |
| 1170 Why do the Siberian methane craters have smooth vertical walls? | |
| 1171 How high must one be for the curvature of the earth to be visible to the eye? | |
| 1172 Why is Earths inner core solid? | |
| 1173 Is climate change a vicious circle? | |
| 1174 Is the sea level rise unusual? | |
| 1175 Does gravity increase the closer to the core you get? | |
| 1176 How do we know the asteroids formed at the same time as earth? | |
| 1177 Similarities between grand circulation solvers and mantle convection solvers | |
| 1178 Why is Earths age given by dating meteorites rather than its own rocks? | |
| 1179 How can we determine the size and composition of Earths inner core? | |
| 1180 Is there any river that does not discharge into larger body of water? | |
| 1181 How does anthropogenic heating affect global warming? | |
| 1182 How would plate tectonics differ if Earth had no water? | |
| 1183 Why do felsic materials have lower melting points than mafic? | |
| 1184 How and why did the oceans form on Earth but not on other planets? | |
| 1185 Is it true that earthquakes are not felt in a cave? | |
| 1186 Why does Coriolis determine the rotation direction of a cyclone but not my drain? | |
| 1187 What factors determine the number of Hadley cells for a planet? | |
| 1188 How much of the current global warming is due to human influence? | |
| 1189 Why is Earths outer-core liquid? | |
| 1190 Why does the salt in the oceans not sink to the bottom? | |
| 1191 At what humidity does it start to rain? | |
| 1192 Is it possible for rivers to freeze completely and stop flowing? | |
| 1193 Where on Earth is the magnetic field intensity stronger? | |
| 1194 Global warming - why doesn´t mankind collect heat (thermal energy) and turn it into electricity or send it to space? | |
| 1195 How would an icicle grow upwards? | |
| 1196 Is this XKCD comic an accurate timeline of the earths average temperature? | |
| 1197 How do weather models work? | |
| 1198 Is earthquake prediction possible? | |
| 1199 What is the status of the Raymo & Ruddiman idea that Tibet cooled the Earth? | |
| 1200 What are deconvolutional layers? | |
| 1201 How to set class weights for imbalanced classes in Keras? | |
| 1202 Micro Average vs Macro average Performance in a Multiclass classification setting | |
| 1203 Whats the difference between fit and fit_transform in scikit-learn models? | |
| 1204 Publicly Available Datasets | |
| 1205 K-Means clustering for mixed numeric and categorical data | |
| 1206 What is the dying ReLU problem in neural networks? | |
| 1207 Difference between isna() and isnull() in pandas | |
| 1208 How to draw Deep learning network architecture diagrams? | |
| 1209 When to use One Hot Encoding vs LabelEncoder vs DictVectorizor? | |
| 1210 When to use GRU over LSTM? | |
| 1211 Best python library for neural networks | |
| 1212 The cross-entropy error function in neural networks | |
| 1213 Train/Test/Validation Set Splitting in Sklearn | |
| 1214 How do you visualize neural network architectures? | |
| 1215 Python vs R for machine learning | |
| 1216 Why do people prefer Pandas to SQL? | |
| 1217 How to get correlation between two categorical variable and a categorical variable and continuous variable? | |
| 1218 SVM using scikit learn runs endlessly and never completes execution | |
| 1219 Choosing a learning rate | |
| 1220 Training an RNN with examples of different lengths in Keras | |
| 1221 Why do cost functions use the square error? | |
| 1222 When should I use Gini Impurity as opposed to Information Gain (Entropy)? | |
| 1223 Backprop Through Max-Pooling Layers? | |
| 1224 How big is big data? | |
| 1225 Advantages of AUC vs standard accuracy | |
| 1226 Time series prediction using ARIMA vs LSTM | |
| 1227 ValueError: Input contains NaN, infinity or a value too large for dtype(float32) | |
| 1228 How are 1x1 convolutions the same as a fully connected layer? | |
| 1229 strings as features in decision tree/random forest | |
| 1230 When to use (He or Glorot) normal initialization over uniform init? And what are its effects with Batch Normalization? | |
| 1231 Data scientist vs machine learning engineer | |
| 1232 Open source Anomaly Detection in Python | |
| 1233 In supervised learning, why is it bad to have correlated features? | |
| 1234 Convert a list of lists into a Pandas Dataframe | |
| 1235 Are Support Vector Machines still considered state of the art in their niche? | |
| 1236 What is dimensionality reduction? What is the difference between feature selection and extraction? | |
| 1237 What is the positional encoding in the transformer model? | |
| 1238 When is a Model Underfitted? | |
| 1239 Cosine similarity versus dot product as distance metrics | |
| 1240 What is the difference between equivariant to translation and invariant to translation | |
| 1241 Cross-entropy loss explanation | |
| 1242 GBM vs XGBOOST? Key differences? | |
| 1243 Clustering geo location coordinates (lat,long pairs) | |
| 1244 Adding Features To Time Series Model LSTM | |
| 1245 Tools and protocol for reproducible data science using Python | |
| 1246 RNN vs CNN at a high level | |
| 1247 Machine learning - features engineering from date/time data | |
| 1248 Why mini batch size is better than one single batch with all training data? | |
| 1249 Latent Dirichlet Allocation vs Hierarchical Dirichlet Process | |
| 1250 Neural networks: which cost function to use? | |
| 1251 Why do internet companies prefer Java/Python for data scientist job? | |
| 1252 How to clone Python working environment on another machine? | |
| 1253 What is the difference between Gradient Descent and Stochastic Gradient Descent? | |
| 1254 Does batch_size in Keras have any effects in results quality? | |
| 1255 How to fight underfitting in a deep neural net | |
| 1256 Is there any domain where Bayesian Networks outperform neural networks? | |
| 1257 IDE alternatives for R programming (RStudio, IntelliJ IDEA, Eclipse, Visual Studio) | |
| 1258 Number of parameters in an LSTM model | |
| 1259 What is the difference between LeakyReLU and PReLU? | |
| 1260 Why Is Overfitting Bad in Machine Learning? | |
| 1261 Should I go for a balanced dataset or a representative dataset? | |
| 1262 How to set batch_size, steps_per epoch, and validation steps? | |
| 1263 Should a model be re-trained if new observations are available? | |
| 1264 Does scikit-learn have a forward selection/stepwise regression algorithm? | |
| 1265 How to deal with version control of large amounts of (binary) data | |
| 1266 Is the R language suitable for Big Data | |
| 1267 What is the Q function and what is the V function in reinforcement learning? | |
| 1268 Sparse_categorical_crossentropy vs categorical_crossentropy (keras, accuracy) | |
| 1269 What is the use of torch.no_grad in pytorch? | |
| 1270 Why should the data be shuffled for machine learning tasks | |
| 1271 How to get accuracy, F1, precision and recall, for a keras model? | |
| 1272 In softmax classifier, why use exp function to do normalization? | |
| 1273 How to interpret the output of XGBoost importance? | |
| 1274 How do subsequent convolution layers work? | |
| 1275 Understanding predict_proba from MultiOutputClassifier | |
| 1276 Data Science in C (or C++) | |
| 1277 How much of data wrangling is a data scientists job? | |
| 1278 Deep Learning vs gradient boosting: When to use what? | |
| 1279 How do I compare columns in different data frames? | |
| 1280 Opening a 20GB file for analysis with pandas | |
| 1281 How to force weights to be non-negative in Linear regression | |
| 1282 How can I transform names in a confidential data set to make it anonymous, but preserve some of the characteristics of the names? | |
| 1283 train_test_split() error: Found input variables with inconsistent numbers of samples | |
| 1284 What is experience replay and what are its benefits? | |
| 1285 How to prepare/augment images for neural network? | |
| 1286 What is Ground Truth | |
| 1287 Merging two different models in Keras | |
| 1288 Why not always use the ADAM optimization technique? | |
| 1289 Multi GPU in Keras | |
| 1290 Can machine learning algorithms predict sports scores or plays? | |
| 1291 Does XGBoost handle multicollinearity by itself? | |
| 1292 Do data scientists use Excel? | |
| 1293 Data science related funny quotes | |
| 1294 What is the difference between model hyperparameters and model parameters? | |
| 1295 Choosing between CPU and GPU for training a neural network | |
| 1296 Encoding features like month and hour as categorial or numeric? | |
| 1297 Why are Machine Learning models called black boxes? | |
| 1298 LightGBM vs XGBoost | |
| 1299 The difference between `Dense` and `TimeDistributedDense` of `Keras` | |
| 1300 What is the advantage of keeping batch size a power of 2? | |
| 1301 When to use what - Machine Learning | |
| 1302 Intuitive explanation of Noise Contrastive Estimation (NCE) loss? | |
| 1303 What loss function to use for imbalanced classes (using PyTorch)? | |
| 1304 Calculation and Visualization of Correlation Matrix with Pandas | |
| 1305 Calculating KL Divergence in Python | |
| 1306 How does Keras calculate accuracy? | |
| 1307 Are there free cloud services to train machine learning models? | |
| 1308 Does gradient descent always converge to an optimum? | |
| 1309 What is the difference between bootstrapping and cross-validation? | |
| 1310 Why is ReLU used as an activation function? | |
| 1311 Do I need to learn Hadoop to be a Data Scientist? | |
| 1312 Is it always better to use the whole dataset to train the final model? | |
| 1313 What are some standard ways of computing the distance between documents? | |
| 1314 StandardScaler before and after splitting data | |
| 1315 Difference between OrdinalEncoder and LabelEncoder | |
| 1316 What do you think of Data Science certifications? | |
| 1317 How to set the number of neurons and layers in neural networks | |
| 1318 When is precision more important over recall? | |
| 1319 Applications and differences for Jaccard similarity and Cosine Similarity | |
| 1320 What are the advantages of HDF compared to alternative formats? | |
| 1321 What would I prefer - an over-fitted model or a less accurate model? | |
| 1322 Organized processes to clean data | |
| 1323 How does the validation_split parameter of Keras fit function work? | |
| 1324 When to use Random Forest over SVM and vice versa? | |
| 1325 Why do we need XGBoost and Random Forest? | |
| 1326 How to do SVD and PCA with big data? | |
| 1327 Best practices to store Python machine learning models | |
| 1328 Quick guide into training highly imbalanced data sets | |
| 1329 Paper: Whats the difference between Layer Normalization, Recurrent Batch Normalization (2016), and Batch Normalized RNN (2015)? | |
| 1330 Do Random Forest overfit? | |
| 1331 Is it necessary to standardize your data before clustering? | |
| 1332 How to calculate mAP for detection task for the PASCAL VOC Challenge? | |
| 1333 Sentence similarity prediction | |
| 1334 What is the best Keras model for multi-class classification? | |
| 1335 Unbalanced multiclass data with XGBoost | |
| 1336 What is the meaning of The number of units in the LSTM cell? | |
| 1337 Why is xgboost so much faster than sklearn GradientBoostingClassifier? | |
| 1338 Meaning of latent features? | |
| 1339 Early stopping on validation loss or on accuracy? | |
| 1340 What is a good way to transform Cyclic Ordinal attributes? | |
| 1341 What are the use cases for Apache Spark vs Hadoop | |
| 1342 How to use the output of GridSearch? | |
| 1343 Hypertuning XGBoost parameters | |
| 1344 Should we apply normalization to test data as well? | |
| 1345 Guidelines for selecting an optimizer for training neural networks | |
| 1346 RNNs with multiple features | |
| 1347 Why use both validation set and test set? | |
| 1348 Neural Network parse string data? | |
| 1349 How to decide neural network architecture? | |
| 1350 Are there any tools for feature engineering? | |
| 1351 Gini coefficient vs Gini impurity - decision trees | |
| 1352 Using TensorFlow with Intel GPU | |
| 1353 What to set in steps_per_epoch in Keras fit_generator? | |
| 1354 Are there any rules for choosing the size of a mini-batch? | |
| 1355 What does Logits in machine learning mean? | |
| 1356 Why is gold golden? | |
| 1357 Why can we smell copper? | |
| 1358 Can an atom have more than 8 valence electrons? If not, why is 8 the limit? | |
| 1359 Why doesnt water burn? | |
| 1360 Is a negative pH level physically possible? | |
| 1361 Why is absolute zero unattainable? | |
| 1362 Is there a general consensus on the causes of the alpha-effect? | |
| 1363 How do you melt metals with super high melting points? | |
| 1364 Is it actually possible to dispose of a body with hydrofluoric acid? | |
| 1365 Is toothpaste solid or liquid? | |
| 1366 What is Bents rule? | |
| 1367 Why is the 2s orbital lower in energy than the 2p orbital when the electrons in 2s are usually farther from the nucleus? | |
| 1368 Does water really go bad after a couple of days? | |
| 1369 If nothing sticks to Teflon, how does Teflon stick to frying pans? | |
| 1370 Is it true that heavy water is not blue? | |
| 1371 Do all salts taste salty? | |
| 1372 Bonding in diatomic C2, a carbon-carbon quadruple bond? | |
| 1373 What causes the old book smell? | |
| 1374 Why would breathing pure oxygen be a bad idea? | |
| 1375 How do people know HCN smells like almonds? | |
| 1376 Ortho-effect in substituted aromatic acids and bases | |
| 1377 Could a magnet pull oxygen out of the air? | |
| 1378 How do organic chemistry mechanisms become accepted? | |
| 1379 Why do elements in columns 6 and 11 assume abnormal electron configurations? | |
| 1380 Why is it wrong to use the concept of hybridization for transition metal complexes? | |
| 1381 How does Walter White make pure crystal meth using a non-stereospecific reaction? | |
| 1382 Why does F replace the axial bond in PCl5? | |
| 1383 Why does pasta really boil over? | |
| 1384 How can one explain niobium’s weird electronic configuration? | |
| 1385 Why does shaking a match put the fire out? | |
| 1386 Why doesnt H₄O²⁺ exist? | |
| 1387 Is iron in the brown ring compound in a +1 oxidation state? | |
| 1388 Why add water first then acid? | |
| 1389 Why is FORTRAN so commonly used in computational chemistry? | |
| 1390 Striking examples where Kohn-Sham orbitals clearly have no physical meaning | |
| 1391 How do I figure out the hybridization of a particular atom in a molecule? | |
| 1392 Are diamonds really forever? | |
| 1393 Why do we write NH3? | |
| 1394 The last elements atomic number | |
| 1395 Positive or Negative Anode/Cathode in Electrolytic/Galvanic Cell | |
| 1396 Why do compounds like SF6 and SF4 exist but SH6 and SH4 dont? | |
| 1397 What makes banana bonds possible in diborane? | |
| 1398 Why do shampoo ingredient labels feature the term Aqua? | |
| 1399 What makes some metals melt at higher temperature? | |
| 1400 What is the pH of ice? | |
| 1401 Is carbon dioxide organic or inorganic? | |
| 1402 Why dont we explode after drinking water? | |
| 1403 Regioselectivity of acid-catalyzed ring-opening of epoxides | |
| 1404 How can I update a map/mesh and coordinates in a PyMol session file? | |
| 1405 Why is it important to use a salt bridge in a voltaic cell? Can a wire be used? | |
| 1406 Why does menthol (e.g. peppermint) feel cool to the tongue? | |
| 1407 Why isnt aluminium involved in biological processes? | |
| 1408 How does chloroform degrade nitrile gloves? | |
| 1409 Why does ice water get colder when salt is added? | |
| 1410 Why is an S-S bond stronger than an O-O bond? | |
| 1411 Unit of the equilibrium constant: contradiction of Bridgmans theorem? | |
| 1412 How can antibonding orbitals be more antibonding than bonding orbitals are bonding? | |
| 1413 Why doesnt frozen sugar solution taste sweet? | |
| 1414 What happens to a radioactive carbon dioxide molecule when its carbon-14 atom decays? | |
| 1415 Why does bond angle decrease in the order H2O, H2S, H2Se? | |
| 1416 Does oil break down condoms? | |
| 1417 Why does wood burn but not sugar? | |
| 1418 Why do the names of most chemical elements end with -um or -ium? | |
| 1419 Is there any substance thats a 4-4-4 on the NFPA diamond? | |
| 1420 Mechanism of arene side chain oxidation by permanganate | |
| 1421 Why is the recipe of Coca Cola still a secret? | |
| 1422 Why does nitration of N,N-dimethylaniline occur at the meta position? | |
| 1423 Fundamental forces behind covalent bonding | |
| 1424 Is buckminsterfullerene aromatic? | |
| 1425 What volume does one mole of an ideal gas occupy? | |
| 1426 Why does sulfur, but not oxygen, catenate? | |
| 1427 What is the reason for the exceptional stability of the cyclopropylmethyl carbocation? | |
| 1428 What is resonance, and are resonance structures real? | |
| 1429 Whats the biggest organic molecule that could have a smell? | |
| 1430 Why can we still breathe in valleys? | |
| 1431 Are the lone pairs in water equivalent? | |
| 1432 Difference between thermodynamic and kinetic stability | |
| 1433 How can carbon dioxide be converted into carbon and oxygen? | |
| 1434 Inductive effect of hydrogen isotopes | |
| 1435 Why does CaCO3 react with HCl, but not with H2SO4? | |
| 1436 Carbon atoms at the edge of a diamond | |
| 1437 Differences between phenols and alcohols | |
| 1438 How can I predict if a reaction will occur between any two (or more) substances? | |
| 1439 Is it safe to drink reboiled water? | |
| 1440 Does heavy water taste sweet? | |
| 1441 What is more acidic: D3O+ in D2O or H3O+ in H2O and why? | |
| 1442 Can an atom bond with more than 8 other atoms? | |
| 1443 The reason behind the steep rise in pH in the acid base titration curve | |
| 1444 Why does whipped cream use nitrous oxide instead of nitrogen gas? | |
| 1445 Why is methanes molecular formula conventionally CH₄, while water is H₂O (among others)? | |
| 1446 Why is the vanadium(3+) ion paramagnetic? | |
| 1447 Why do SN1 and SN2 reactions not occur at sp2 centres? | |
| 1448 Why can a diamond be broken using a hammer if its the hardest natural substance known? | |
| 1449 Why does cyclopropane react with bromine? | |
| 1450 Why do impurities lower the melting point of an isolated substance? | |
| 1451 What causes the rotting fish smell? | |
| 1452 Do molecules with bridges through rings exist? | |
| 1453 Do symmetric hydrogen bonds in neutral molecules exist? | |
| 1454 What is the inert pair effect? | |
| 1455 How to derive these general formulae for number of stereoisomers of a compound with a possible plane of symmetry? | |
| 1456 Is there ANY chemical that can destroy PTFE, or Teflon? | |
| 1457 How can the dipole moment of carbon monoxide be rationalised by molecular orbital theory? | |
| 1458 Can 100% covalent bonds exist? | |
| 1459 Which exotic salt can lower waters freezing point by 70 °C? | |
| 1460 How does ammonium nitrate explode on its own? | |
| 1461 Why is arsenous acid denoted H3AsO3? | |
| 1462 Why is fresh ice sticky? | |
| 1463 Five-pointed crown alkane C25H40: does it exist? | |
| 1464 Is Hexafluorocyclohexane the Most Polar Small Molecule? | |
| 1465 Why do we use helium in balloons? | |
| 1466 Choosing the right condenser | |
| 1467 Why is the bond angle H-P-H smaller than H-N-H? | |
| 1468 Why is BCl3 a monomer whereas AlCl3 exists as a dimer? | |
| 1469 What exactly is happening when sodium, potassium, or other alkali metal explodes in water? | |
| 1470 Relativistic effect: d-electrons in metallorganic complexes | |
| 1471 Why does carbon monoxide have a greater affinity for hemoglobin than oxygen? | |
| 1472 What is a non-classical carbocation? | |
| 1473 What is the difference between ∆G and ∆G°? | |
| 1474 Why super glue does not stick inside their own bottle? | |
| 1475 What do the prefixes meta, ortho, pyro mean in inorganic chemistry? | |
| 1476 Why is pyrimidine less basic than pyridine? | |
| 1477 Why does potassium react more violently with water than lithium? | |
| 1478 Generating neat orbitals/surfaces from molden/wfn-files | |
| 1479 How do I visualize an atom? | |
| 1480 DFT Functional Selection Criteria | |
| 1481 Difference between shells, subshells and orbitals | |
| 1482 Why does alcoholic KOH prefer elimination whereas aqueous KOH prefers substitution? | |
| 1483 Why do atoms generally become smaller as one moves left to right across a period? | |
| 1484 What is known about liquid carbon? | |
| 1485 Gibbs free energy-minimum or zero? | |
| 1486 Is methanol more acidic than water? | |
| 1487 IUPAC nomenclature: Smallest sum of locants? | |
| 1488 Why is chemistry unpredictable? | |
| 1489 A compound that absorbs all visible light | |
| 1490 Natural Bond Orbital analysis: Significance of stabilization energy determined by 2nd order perturbation | |
| 1491 Does any known substance ignite on cooling? | |
| 1492 IUPAC nomenclature for an interesting looking organic compound | |
| 1493 What are the maximum number of electrons in each shell? | |
| 1494 Chemistry behind Gales coffee maker in Breaking Bad | |
| 1495 A glass of water with ice-cubes in it. Wheres the water the coldest; at the top or bottom? | |
| 1496 What exactly is hydrogen bonding (and does it really need fluorine, oxygen, or nitrogen)? | |
| 1497 Splitting of multiplets in ¹H NMR spectra? | |
| 1498 What is actually the difference between valence bond theory and molecular orbital theory? | |
| 1499 Why isnt ethane used for cooking? | |
| 1500 Why are there two Hydrogen atoms on some periodic tables? | |
| 1501 Can hot food ever emit x-rays or gamma rays? | |
| 1502 What would follow in the series sigma, pi and delta bonds? | |
| 1503 Are metallic/ionic bonds weaker than covalent bonds? | |
| 1504 Why is gold unreactive when only one electron is in the outer shell? | |
| 1505 Is pyrene aromatic despite failing Hückels rule? | |
| 1506 Is density functional theory an ab initio method? | |
| 1507 Does O2 have a color in the gas phase | |
| 1508 Has anyone even taken a picture of a molecule to confirm the geometry predicted by theory? | |
| 1509 Why isnt chemically-strengthened glass made with potassium carbonate to begin with? | |
| 1510 May I treat units (e.g. joules, grams, etc.) in equations as variables? | |
| 1511 Stereoselectivity of dihydroxylation with osmium tetroxide | |
| 1512 Why is the letter J omitted in the spdf... sequence? | |
| 1513 Hypervalency and the octet rule | |
| 1514 Pauli exclusion principle and resonance | |
| 1515 Proper typography of NOx | |
| 1516 Synthesis Golf II: Erythronolide B | |
| 1517 Single-molecule magnet with electrically-controlled permeability: How does the Titan Shield from Deus Ex work? | |
| 1518 How do I extract cyanide from apple seeds? | |
| 1519 Tetrahedral or Square Planar | |
| 1520 Why is [PdCl4]2- square planar whereas [NiCl4]2- is tetrahedral? | |
| 1521 Acidity of substituted phenols | |
| 1522 Why cant Pd/C and H2 reduce both the alkene and carbonyl portions of α,β-unsaturated carbonyls? | |
| 1523 Why is the bond length of CO+ less than that of CO? | |
| 1524 Why do chemistry and physics have different sign convention in thermodynamics? | |
| 1525 Why dont the electrons move through the electrolyte (instead of the circuit) in a galvanic cell? | |
| 1526 Why is methanol toxic? | |
| 1527 Effect of drinking ultra-pure water | |
| 1528 Would it be possible to destroy gold? | |
| 1529 Middle row anomaly of the periodic table | |
| 1530 When is it true that more nodes equals higher energy? | |
| 1531 Soaps come in different colors, but why is soap lather always white? | |
| 1532 How much CO2 could you remove from the atmosphere with 2 trillion USD? | |
| 1533 Why are isotopes of hydrogen the only ones with special names? | |
| 1534 Is there an energy cost associated with flipping the spin of an electron? | |
| 1535 Synthesis Golf I: Sodium Fluvastatin | |
| 1536 Flammability (NFPA) - how is it defined? | |
| 1537 What would be the effect of the addition of an inert gas to a reaction at equilibrium? | |
| 1538 Whats the difference between a nucleophile and a base? | |
| 1539 Why does basicity of group 15 hydrides decrease down the group? | |
| 1540 Is the ammonium substituent (-NH3+) really meta-directing in electrophilic substitution? | |
| 1541 Where did amino acids get their one-letter codes? | |
| 1542 Realistic chemical spill accident in high school chemistry class | |
| 1543 What caused the flashes in the video footage of Chernobyl? | |
| 1544 How are poisons discovered? Does someone have to die/be poisoned from it first? | |
| 1545 Why does hyperconjugation help for ring cleavage? | |
| 1546 What do the different grades of chemicals mean? | |
| 1547 What are the meanings of dotted and wavy lines in structural formulas? | |
| 1548 Why does pyrite form cubic crystals? | |
| 1549 Why does burnt hair smell bad? | |
| 1550 What roles do neutrons play in an atom? | |
| 1551 Why does the unstabilised Wittig reaction selectively form cis alkenes? | |
| 1552 Relative stability of cis and trans cycloalkenes | |
| 1553 Are there non-transparent gases? | |
| 1554 What is the molecular structure of xenon hexafluoride? | |
| 1555 What makes ice slippery? | |
| 1556 What makes Gorilla Glass more durable with each generation? | |
| 1557 Why do transition elements make colored compounds? | |
| 1558 Difference between exothermic and exergonic | |
| 1559 What is the unit of pH? | |
| 1560 Why does the 3rd electron shell start filling up with scandium? | |
| 1561 What is the strongest acid? | |
| 1562 Why are there only 7 types of unit cells and 14 types of Bravais lattices? | |
| 1563 Melting and boiling point trend in Group II | |
| 1564 Why is -ethane in methane? | |
| 1565 What is the exchange interaction? | |
| 1566 Are graphite and hexagonal boron nitride aromatic | |
| 1567 Why dont gases escape Earths atmosphere? | |
| 1568 How to properly store acids at home? | |
| 1569 Is honey really a supersaturated solution? Does heating to un-crystalize redissolve it or melt it? | |
| 1570 d-orbital splittings in WS2 monolayer | |
| 1571 Imaginary Bonding Interactions | |
| 1572 What are angular and radial nodes? | |
| 1573 Is alcohol really a solution? | |
| 1574 Why are covalent bonds directional? | |
| 1575 What metals arent dissolved in/attacked by aqua regia? | |
| 1576 What is the pKa of the hydronium, or oxonium, ion (H3O+)? | |
| 1577 Carbon with 5 bonds? | |
| 1578 Microwaving a glass of water, what happens? | |
| 1579 Which is the densest gas known? | |
| 1580 Electrical conductivity of graphite | |
| 1581 Why are DCM and chloroform so resistant towards nucleophilic substitution? | |
| 1582 What substances do humans consume that are caloric but neither protein, carb, nor fat? | |
| 1583 Why does chocolate melt so easily? | |
| 1584 Is activated carbon classified as organic or inorganic? | |
| 1585 Why is the Vitamin B complex, a complex? | |
| 1586 Is stainless a bulk or a surface property of stainless steel? | |
| 1587 How do orbitals coexist with a nucleus? | |
| 1588 Is there radioactivity at absolute zero? | |
| 1589 How heavy should an element be, to be a Heavy Metal? | |
| 1590 How to name binary (inorganic) compounds given their chemical formula, and vice-versa? | |
| 1591 Why is −78 °C a magic temperature for organic reactions? | |
| 1592 Why is 1-ethylidene-4-methylcyclohexane chiral? | |
| 1593 How do non-polar substances dissolve in non-polar solvents? | |
| 1594 How do you separate enantiomers? | |
| 1595 Acid Accident Treatment | |
| 1596 Why are solids and liquids not included in the equilibrium constant? What about in a reaction rate calculation? | |
| 1597 Why do atoms want to have a full outer shell? | |
| 1598 What happens to gunpowder when it gets wet? | |
| 1599 Which carbocation is more stable, the ethyl- or 1-propyl-carbocation? | |
| 1600 Why is water the universal solvent? | |
| 1601 Why are noble gases stable | |
| 1602 Why isnt the American nickel magnetic? | |
| 1603 What are oxidation states used for? | |
| 1604 Can magnetic fields affect a chemical reaction? | |
| 1605 When a candle burns, why does the top of wick glow if bottom of flame is hottest? | |
| 1606 What properties of carbon dioxide make it a greenhouse gas? | |
| 1607 Why is cyclooctateraene shaped like a tub rather than a chair? | |
| 1608 What happens if you cool water in a container too small for it to freeze? | |
| 1609 Why is fluorine a gas, but lithium isnt? | |
| 1610 Do electrons have some volume, area or shape? | |
| 1611 Are the bonding orbitals in methane equivalent - photoelectron spectrum | |
| 1612 Why are there no cheap diamond equivalents? | |
| 1613 Why is heroin a more potent drug than morphine, despite having a similar structure? | |
| 1614 Unusual Friedel–Crafts alkylation with pivaloyl chloride | |
| 1615 Suggest methods and basis sets for a variety of systems | |
| 1616 How many molecules does it take to have a phase? | |
| 1617 Why is snow white? | |
| 1618 How do Quantum Software Packages Work? | |
| 1619 Whats a minimal yet chemically-meaningful kinetic system for an oscillating reaction? | |
| 1620 What makes a radical free? | |
| 1621 How does Palladium dissociate H₂ so easily? | |
| 1622 What is the difference between D and L configuration, and + and −? | |
| 1623 How much gold is there in our sun? | |
| 1624 How loud would the Sun be? | |
| 1625 Does the Sun rotate? | |
| 1626 How can there be 1,000 stellar ancestors before our Sun? | |
| 1627 Why is the discovery of merging neutron stars important? | |
| 1628 Why dont astronomers use meters to measure astronomical distances? | |
| 1629 Could the dinosaurs have seen the asteroid that killed them? | |
| 1630 Is the moon only 60 pixels? | |
| 1631 Why is only one side of the Moon visible from Earth? | |
| 1632 How does the Earth move in the sky as seen from the Moon? | |
| 1633 Why not take a picture of a closer black hole? | |
| 1634 Can gravitational waves pass through a black hole? | |
| 1635 Is it dark inside the Sun? | |
| 1636 Does the Milky Way move through space? | |
| 1637 Why is there a zig-zag in elemental abundances? | |
| 1638 If a massive object like Jupiter flew past the Earth how close would it need to come to pull people off of the surface? | |
| 1639 How many planets are there in this solar system? | |
| 1640 When will the Sun end all human life on Earth? | |
| 1641 Why is the asteroid belt shaped like a triangle? | |
| 1642 Would we have more than 8 minutes of light, if the Sun went out? | |
| 1643 If two black hole event horizons overlap (touch) can they ever separate again? | |
| 1644 Why hasnt the 9th Planet been detected already? | |
| 1645 What is the hottest thing in the universe? | |
| 1646 Where did TRAPPIST-1a go? | |
| 1647 If light has no mass, why is it affected by gravity? | |
| 1648 Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth? | |
| 1649 Why is moon light not the same color as sunlight? | |
| 1650 What would happen if an ice cube is left in space? | |
| 1651 Sun constantly converts mass into energy, will this cause its gravity to decrease? | |
| 1652 Is there any role today that would justify building a large single dish radio telescope to replace Arecibo? | |
| 1653 How powerful a telescope would allow me to view the astronauts aboard ISS do a space-walk? | |
| 1654 Is there a star over my head? | |
| 1655 Why has Venuss atmosphere not been stripped away by solar wind? | |
| 1656 How did Astronomers deduce that the Sun was not a ball of fire? | |
| 1657 Why does it take so long to transmit an image from New Horizons to Earth? | |
| 1658 Two species of dark matter? | |
| 1659 Does the Milky Way orbit around anything? | |
| 1660 If Earth is tilted, why is Polaris always above the same spot? | |
| 1661 Is it possible to achieve a stable lunarstationary orbit around the moon? | |
| 1662 Why is Mars cold? | |
| 1663 How can HD 140283 be older than the universe? | |
| 1664 Does matter accumulate just outside the event horizon of a black hole? | |
| 1665 Where does the Solar System end? | |
| 1666 What is in the center of the universe? | |
| 1667 Does the sun cross other spiral arms in its movement around the galaxys center? | |
| 1668 Why do Black Holes in the middle of galaxies not suck up the whole galaxy? | |
| 1669 How does neutron star collapse into black hole? | |
| 1670 How do we have photos of galaxies so far away? | |
| 1671 How old is the oldest light visible from Earth? | |
| 1672 Are photons aged? | |
| 1673 Why does the Sun have different day lengths, but not the gas giants? | |
| 1674 Why does gas form a star instead of a black hole? | |
| 1675 Why is Gaia operating around Earth orbit? Why not send it to Neptunes orbit? | |
| 1676 Why is our solar system tipped about 63° with respect to the plane of our galaxy? | |
| 1677 Are new stars less pure as generations go by? | |
| 1678 How are black holes found? | |
| 1679 Can the moon appear to be in any position in the sky? | |
| 1680 How do scientists know that the distant parts of the universe obey the physical laws exactly as we observe around us? | |
| 1681 Do all stars have an Oort cloud or is it a rare occurence? | |
| 1682 Why are we building larger land-based telescopes instead of launching larger ones into space? | |
| 1683 Is Earths moon the only one where a total eclipse of the sun covers the entire sun? | |
| 1684 Why are there uneven bright areas in this photo of black hole? | |
| 1685 How do we know that black holes are spinning? | |
| 1686 How large can a ball of water be without fusion starting? | |
| 1687 Closest star system to Alpha Centauri? | |
| 1688 How do we distinguish old craters from new ones on the Moon? | |
| 1689 How can comets have tails if theres no air resistance in space? | |
| 1690 How do I calculate the inclination of an object with an amateur telescope? | |
| 1691 Is it a coincidence that on the far side of the moon almost no seas are visible? | |
| 1692 9th planet location? | |
| 1693 Why cant we see Saturns phases from earth? | |
| 1694 Why does the Moon appear gray when passing between the Sun and the Earth? | |
| 1695 Are there any stars that orbit perpendicular to the Milky Ways galactic plane? | |
| 1696 Why does Jupiter have so many moons? | |
| 1697 Why doesnt the moon twinkle? | |
| 1698 Considering our methods of exploration, how likely is it that there are unfound planets (not dwarf planets) in our solar system? | |
| 1699 How exactly does Hawking radiation decrease the mass of black holes? | |
| 1700 Do moons have moons? | |
| 1701 If you lived on the far side of the Moon, how could you infer the existence of Earth? | |
| 1702 Whats the fastest moving object in the universe? | |
| 1703 Why do the planets in our solar system orbit in the same plane? | |
| 1704 Did I see another planet? | |
| 1705 Is Venus in some way tidally locked to... Earth? | |
| 1706 What did LIGO Actually See? (Gravitational waves discovery) | |
| 1707 How was the mass of Venus determined? | |
| 1708 Where can I find the positions of the planets, stars, moons, artificial satellites, etc. and visualize them? | |
| 1709 Could any known, living organisms on Earth survive on Mars? | |
| 1710 Why do (most of) the planets rotate counterclockwise, i.e. the same way the Sun does? | |
| 1711 How should I deal with becoming discouraged as a graduate student? | |
| 1712 How to ask dumb questions | |
| 1713 Upset by male classmates openly comparing female students according to physical appearance | |
| 1714 I dont want to kill any more mice, but my advisor insists that I must in order to get my PhD | |
| 1715 Should I share my horrible software? | |
| 1716 Moral dilemma in unwittingly being paid to complete a students work | |
| 1717 How to effectively deal with Imposter Syndrome and feelings of inadequacy: Ive somehow convinced everyone that Im actually good at this | |
| 1718 How to avoid procrastination during the research phase of my PhD? | |
| 1719 A paper I received to review has (independently) duplicated work that we are writing up. How to proceed in light of peer-review confidentiality? | |
| 1720 Why do American colleges and universities have sports teams? | |
| 1721 Sex worker student offering her (lawful) services | |
| 1722 How to read papers without falling into a rabbit hole? | |
| 1723 A published paper stole my unpublished results from a science fair | |
| 1724 Failing students when it might cause them economic ruin | |
| 1725 Female students coming to office hours in overly revealing clothing | |
| 1726 How to avoid being falsely accused of harassment by a student? | |
| 1727 Professor creates assignment making students advocate for a bill being presented to Congress. Is this legal? | |
| 1728 Have I embarassed my supervisors by solving a problem that a PhD student in my group was working on without success? | |
| 1729 I believe I have solved a famous open problem. How do I convince people in the field that I am not a crank? | |
| 1730 What to do when your student is convinced that he will be the next Einstein? | |
| 1731 University rank/stature - How much does it affect ones career post-Ph.D? | |
| 1732 Writing a recommendation letter for a student I reported for academic dishonesty | |
| 1733 Why would an academic write a textbook for free? | |
| 1734 Postdoc overwhelmed by incomplete work | |
| 1735 What to do with a student coming to class in revealing clothing, to the degree that it disrupts the teaching environment? | |
| 1736 How can I recover professionally from being a crank? | |
| 1737 Can I add a baby as a co-author of a scientific paper, to protest against co-authors who havent made any contribution? | |
| 1738 May a man attend a workshop entitled “Young women in [domain]”? | |
| 1739 How to deal with an advisor who wants a friendlier relationship with me than I do? | |
| 1740 How to stop hopping the learning chain and actually begin somewhere? | |
| 1741 How can I convince graduate students in China to not copy/paste from the Internet into their research papers? | |
| 1742 How to deal with a student who most likely has a mental condition, and keeps arguing with me in class? | |
| 1743 Is it possible to recover after a career setback such as this? | |
| 1744 How do you cite a Github repository? | |
| 1745 Quoting a typo: Do I really have to do sic, or can I just fix the sentence? | |
| 1746 I realize I made a huge mistake in my thesis and am not sure what to do. Im defending very soon (days away). What should I do? | |
| 1747 Religious supervisor wants to thank god in the acknowledgements | |
| 1748 Is it acceptable to publish student names with the label stupid question, on a publicly-visible website? | |
| 1749 Grades are too high for the department - what should I do? | |
| 1750 My research paper filed as a patent in China by my Chinese supervisor without me as inventor | |
| 1751 Grant fraud, should I bust my PhD advisor? | |
| 1752 Why dont researchers publish failed experiments? | |
| 1753 What does the typical workflow of a journal look like? | |
| 1754 How do you come to terms with the fact that you might never be among the best in your research community? | |
| 1755 Do I have the legal right to demand information on plagiarism of my work from another university? | |
| 1756 Why are papers without code but with results accepted? | |
| 1757 In a formal paper, should I censor brainf**k, the name of a programming language? | |
| 1758 How do you judge the quality of a journal? | |
| 1759 Why do many talented scientists write horrible software? | |
| 1760 Profs neurological health is declining rapidly. What can I (TA) do? | |
| 1761 My paper is being cited in vaccine misinformation. What do I do? | |
| 1762 How honest should one be with their students when talking about the realities of academia? | |
| 1763 What to do about questions that are designed to embarrass the speaker? | |
| 1764 I (independently) solved a fellow students research problem. I want to publish it. What should I do? | |
| 1765 How to deal with failing a student? | |
| 1766 Is Obamas JAMA paper OK? | |
| 1767 Why are most scientific articles locked behind a paywall? | |
| 1768 What does first authorship really mean? | |
| 1769 How can a TA help a student who is certain she sucks at programming? | |
| 1770 Our teacher is encouraging us to use cracked software | |
| 1771 I am uncomfortable about students taking pictures of the blackboard, because I dont like appearing in them | |
| 1772 Appropriateness of dedicating my thesis to a Jewish mathematician who died in a concentration camp | |
| 1773 Teaching a class likely meant to inflate the GPA of student athletes | |
| 1774 Rediscovery of calculus in 1994: what should have happened to that paper? | |
| 1775 A student in my course does well on exams, but doesnt do the homework: Go easy on them, or make them pay the price? | |
| 1776 What to do if a referee plagiarises the result after rejecting a paper? | |
| 1777 Does one need to be affiliated with a university to publish papers? | |
| 1778 Is it appropriate for a professor to require students to sign a non-disclosure agreement before being taught? | |
| 1779 How to deal with a very weak student? | |
| 1780 Should I intervene when a colleague in a different department makes students run laps as part of their grade? | |
| 1781 How does the admissions process work for Ph.D. programs in the US, particularly for weak or borderline students? | |
| 1782 Will ISIS attacks hurt my PhD application as a Muslim? | |
| 1783 My professor is rigging data and plagiarizing. What can I do? | |
| 1784 Is declining an undergraduate award which causes me discomfort appropriate? | |
| 1785 Is it ethical to submit a paper with the name of a co-author who cannot be contacted? | |
| 1786 How do I handle a colleagues gender change when citing their paper? | |
| 1787 Best-practice models for research code? | |
| 1788 I slept with my advisors daughter and she is blackmailing me now. What can I do? | |
| 1789 Should I simply ignore it if authors assume that Im male in their response to my review of their article? | |
| 1790 Whats the point of PhD theses if nobody reads them? | |
| 1791 Why do most people think its a bad idea to read from slides? | |
| 1792 Why is my mood dictated so much by how well my research is going? | |
| 1793 Is there a place in academia for someone who compulsively solves every problem on their own? | |
| 1794 How hard do early-career academics in the United States work, really? | |
| 1795 Can leaked nude pictures damage ones academic career? | |
| 1796 How to build healthy working relationships with my male colleagues as a young-ish, attractive-ish woman? | |
| 1797 Useful strategies for answering dumb questions in a talk? | |
| 1798 Reporting a student who may be psychologically disturbed | |
| 1799 Is it ethical to profit by having my students buy my textbook? | |
| 1800 Two years into my PhD program, and Mom is dying of cancer. Should I tell my advisor about it? | |
| 1801 What to do about grade grubbers? | |
| 1802 I am an editor for a lousy paper and I found a better algorithm than theirs. Must I share it with them? | |
| 1803 Should a young professor avoid using dating apps? | |
| 1804 How do I identify predatory and low quality journals? With Bealls List gone, how can I tell if a journal is spam? | |
| 1805 Is publishing runnable code instead of pseudo code shunned? | |
| 1806 Why are professors websites so ugly? | |
| 1807 Should professors intervene if a student is wearing offensive clothing in their classroom? | |
| 1808 Is it ethical/acceptable to give a lighter penalty to students who admit to cheating? | |
| 1809 My students family wont let her study what she wants | |
| 1810 Should the slides in a presentation be self-explanatory or be as minimal as possible? | |
| 1811 Is it okay to report classmates cheating on exams? | |
| 1812 Should I quit my PhD - workload, self-esteem and social life | |
| 1813 Should I have doubts if the organizers of a workshop ask me to sign a behavior agreement upfront? | |
| 1814 Is ignoring emails acceptable in academia? | |
| 1815 How to supervise a bad PhD student | |
| 1816 Should I send professors money for illegally downloading their books? | |
| 1817 Taking an academic pseudonym? | |
| 1818 Slept through final, professor is giving me a zero and failing me – is there anything I can do to change this? | |
| 1819 How do you get a bad transcript past Ph.D. admissions? | |
| 1820 Knowing that most students submit assignments right around the deadline, is it advisable not to set deadline that is very late at night? | |
| 1821 I was caught cheating on an exam, how can I minimize the damage? | |
| 1822 How do you answer Oh, youre a professor? What do you teach? | |
| 1823 Choice of personal pronoun in single-author papers | |
| 1824 Software to draw illustrative figures in papers | |
| 1825 In a yes/no question, a student gives the right answer and an unnecessary but wrong explanation. How to grade? | |
| 1826 Do academics look down on well-designed academic websites? | |
| 1827 Asked again to review a paper, when the authors dont wish to modify it | |
| 1828 Fellow student asked question from take-home exam on Stack Exchange | |
| 1829 How to react when encountering students who have previously failed my course? | |
| 1830 How to deal with anxiety and depression after being kicked out of PhD program? | |
| 1831 What should I do after advisor got upset when I expressed belief in evolution and then said he couldnt add me to his research team? | |
| 1832 How to argue against questionable research practices such as P-hacking and Harking? | |
| 1833 What is this can I hire you as a tutor scam? | |
| 1834 Gender transition as a starting faculty member: a terrible idea? | |
| 1835 If I request a paper through my university library, must they pay a substantial amount of money? | |
| 1836 Is it appropriate to email a professor saying you enjoyed their class, after doing well in it? | |
| 1837 Advisor tries to reproduce my results to ensure my honesty. Is it the norm? | |
| 1838 What is the purpose of women-only meetings, panels, conferences, etc. in academia? | |
| 1839 How to come up with research ideas? | |
| 1840 Googling my name reveals silly things from when I was younger. I am embarassed. How will this affect me in my future academic career? | |
| 1841 What to remember when supervising female PhD students? | |
| 1842 How to stop feeling guilty about unfinished work? | |
| 1843 Asking questions in class: how can I exit a Q&A when I havent really understood? | |
| 1844 How to deal with arrogant e-mail of a student | |
| 1845 Why do researchers sometimes use extremely complicated English sentences to convey their meaning? | |
| 1846 Why are research papers written in language thats difficult for undergraduate students? | |
| 1847 Do I not have the personality for a PhD? | |
| 1848 Editor rejected manuscript claiming it is similar to a not-yet-published manuscript (that I havent seen). How to proceed? | |
| 1849 What are fake, shady, and/or predatory journals? | |
| 1850 Only one student answered an exam question - and I strongly suspect he cheated | |
| 1851 Why do students go for a PhD even when chances of getting academic jobs on its completion are slim? | |
| 1852 Is doing two PhDs a good path? | |
| 1853 How to silence the voice that tells you youre being financially irresponsible by spending 4 to 6 years doing a PhD? | |
| 1854 Why do Americans care so much about recommendation letters? | |
| 1855 What is the point of listing 1000 authors for a single scientific paper? | |
| 1856 How to approach a student with bad hygiene? | |
| 1857 Dressing down to impress in academic settings | |
| 1858 Why is plagiarism so harshly punished? | |
| 1859 What makes someone deserving of a Ph.D.? | |
| 1860 Student caught cheating when leaving class after handing me the exam | |
| 1861 What is the best last slide in a thesis presentation? | |
| 1862 How can I prevent students from writing answers on an assignment, then claiming I didnt see their answer? | |
| 1863 Is it okay for a professor to leave the classroom only 5 min past the class start if nobody has shown up? | |
| 1864 Is it reasonable for a professor to ask students to stay 30-45 minutes past scheduled class time every week? | |
| 1865 PhD Student : Publish Paper with Wife? | |
| 1866 Is Academia really just a huge competition? | |
| 1867 What can I do when some people stole my master thesis work and published it as their own work? | |
| 1868 What should I do if my advisor is forcing me to vote on a specific candidate in IEEE elections? | |
| 1869 None of 25 students at question session before exam has a question. What should lecturer do? | |
| 1870 Why is it acceptable that publishers sell papers they didn’t pay for? | |
| 1871 How to respond to a company that wants specific details on implementation of my PhD research? | |
| 1872 Should I recommend a student with a bad ideology? | |
| 1873 How to prevent students from using modified calculators to cheat on exams? | |
| 1874 Is it ethical for a professor to get masters students to work on open source modules related to the professors profit-making company? | |
| 1875 My teaching evaluations arrived and female students statistically gave me worse scores than male students. Is there any possible explanation? | |
| 1876 How to handle requests for a race-based exam structure? | |
| 1877 Ethical concerns regarding the review of a paper on autonomous armed drones | |
| 1878 Why do universities fund Ph.D. students in the sciences? | |
| 1879 What is a “sandwich thesis”? | |
| 1880 What is behind the Indian Undergrad Research Experience-spam? | |
| 1881 Submitting paper proving X soon after paper proving X-epsilon | |
| 1882 Assistant professor vs Associate professor | |
| 1883 What to do if I have seen an exam before I have taken it? | |
| 1884 Has anyone, based on great performance, ever been awarded a higher degree than the one they enrolled for? | |
| 1885 What to do if most of my students have switched to a better lecturers class? | |
| 1886 Professor falsely accusing me of cheating in a class he does not teach, two months after end of the class. What precautions should I take? | |
| 1887 Is it unethical to supply a marked solution to a student who has shown intent to cheat, with the intent of identifying them for punishment? | |
| 1888 A famous scholar sent me an unpublished draft of hers. Then she died. I think her work should be published. What should I do? | |
| 1889 My admission is revoked after accepting the admission offer | |
| 1890 Is having access to past exams cheating and, if yes, could it be proven just by a good grade? | |
| 1891 Will my cancer ruin my chances of going to graduate school in math? | |
| 1892 The overwhelming silence in shy classes | |
| 1893 Students bringing babies to class | |
| 1894 I lost my students quizzes due to a theft, what should I do? | |
| 1895 How can I address a student systematically boosting their grades by filing frivolous complaints? | |
| 1896 One of my student researchers is likely falsifying some results/data. What are the consequences? | |
| 1897 Professor does not care about cheating, what should TA do? | |
| 1898 What happens if a math PhD student fails to find a proof that is the main objective of his/her thesis topic? | |
| 1899 During peer-review, should I comment on the authors messy code? | |
| 1900 How do I deal with a candidate mentioning God twelve times in their application? | |
| 1901 Is it true that PhD students need to work 10-12 hours a day every day to be productive? | |
| 1902 Just started a postdoc, but it went REALLY bad, REALLY fast. Stay or go? | |
| 1903 I have stack-exchanged through my undergrad math program. Am I likely to succeed in mathematics PhD programs? | |
| 1904 E-mail address to use in publications | |
| 1905 The GRE: Why does this still exist? | |
| 1906 Do authors have to be politically correct in article-writing? | |
| 1907 Why do some instructors care so much about attendance? | |
| 1908 If I quit my PhD, would it make my advisor look bad? | |
| 1909 Im feeling discouraged after getting tenure; should I quit? | |
| 1910 What should I do when my accepted paper is subsequently rejected? | |
| 1911 Why cant universities work around the proposed reclassification of tuition remission as taxable income, by not charging tuition? | |
| 1912 How to be a co-author anonymously? | |
| 1913 Is it possible to work full time and complete a PhD? | |
| 1914 What to say to a student who has failed? | |
| 1915 How to tell an over-confident student they still have a lot to learn? | |
| 1916 When should a supervisor be an author? | |
| 1917 Are non-citizen Muslim professors and students going to be removed from US universities and subsequently deported by Trumps ban? | |
| 1918 Is web-presence important for researchers? | |
| 1919 Is there an affordable way for non-students to subscribe to multi-journals/archives? | |
| 1920 Should I report a PhD student’s incompetence to their supervisor? | |
| 1921 You are paid to answer my questions! - how to handle silly questions? | |
| 1922 I want to do research but Im too old for a PHD | |
| 1923 Why is peer review so random? | |
| 1924 Where do bad papers go to die? | |
| 1925 How do I talk about my abusive former advisor if people ask? | |
| 1926 Walk up and talk to random people at academic conferences - is that appropriate? | |
| 1927 What makes academic failure different from failure in another career? | |
| 1928 My supervisor doesnt believe in depression | |
| 1929 Techniques for good board handwriting | |
| 1930 Should I seek professional help because I have a lot of math books? | |
| 1931 Is it ok to upload joke papers to arXiv? | |
| 1932 PhD student, issued contract at year 3 which will sign over intellectual property. Is it legal? | |
| 1933 Donating money to scientific research after my death | |
| 1934 How to handle lecturer who doesnt let me use my phone? | |
| 1935 What is the justification for the typical punishment of a student who did not cheat but helped others cheat? | |
| 1936 How do mathematicians conduct research? | |
| 1937 Is it OK to refuse to cite paywalled papers? | |
| 1938 Are college students forbidden from sharing their grades with other students? | |
| 1939 How can I avoid being the negative one when giving feedback on statistics? | |
| 1940 Editor asks for π to be written in roman | |
| 1941 I am non-tenured and have been offered a tenure-track position at my current university, but I dont want to stay here long term. What should I do? | |
| 1942 Typical experiences of transgender people in academia? | |
| 1943 How to react to a student proselytising during office hours? | |
| 1944 How to quiet noisy undergrads students during lecture | |
| 1945 Why do professors want to make sure that their notes written on the blackboard will not be published? | |
| 1946 Two-thirds of my class colluded. Should I report them to the academic offences committee? | |
| 1947 How should I proceed when a (famous) professor says Im not good enough for research? | |
| 1948 What can I do if my advisor wants me to keep working, even while Im on medical leave for severe depression? | |
| 1949 How to avoid a hostile takeover of first authorship during medical leave? | |
| 1950 How to react when a team of colleagues obviously made up some results? | |
| 1951 As a department head, what to do if a professor leaves without giving out grades? | |
| 1952 How to become well-known in the research community while being a PhD student | |
| 1953 Should I report an accepted PhD thesis in which the literature review is copied verbatim from sources? | |
| 1954 Am I reading enough of the scientific literature? Should I read for breadth or depth? | |
| 1955 Should I explain to the graduate admission committee why I am older than most prospective PhD students? | |
| 1956 Strategies for teaching with facial aphasia (inability to recognize faces aka prosopagnosia, face-blindness) | |
| 1957 Use of first person in a PhD Thesis | |
| 1958 Is 8:00 AM an unreasonable time to meet with my graduate students and post-doc? | |
| 1959 A student keeps using a native language while asking questions in the class when the course is taught in English | |
| 1960 As a TA, how to react if I come across a Facebook group in which students insult me? | |
| 1961 What is the origin of the underwater basket weaving meme in Academia? | |
| 1962 Are there good reasons to avoid using color in research papers? | |
| 1963 What productive academic work can you do with minimal attention in a small (<30 minutes) block of time? | |
| 1964 How should I deal with very negative feedback from some students? | |
| 1965 What is the point of a lecture when you have a textbook? | |
| 1966 Where did I lose control of my studies? | |
| 1967 First year Math PhD student; My problem solving skill has been completely atrophied and continues to decline | |
| 1968 Referee says the proof is wrong, but it is not, what to do? | |
| 1969 Should I tell students that its my first time teaching the course? | |
| 1970 Why are some professors critical of even casual use of Wikipedia? | |
| 1971 Counter strategy against group that repeatedly does strategic self-citations and ignores other relevant research | |
| 1972 How to train students to write high-quality research papers? | |
| 1973 How do I reference the Python programming language in a thesis or a paper? | |
| 1974 What are the potential pitfalls of having a PhD? | |
| 1975 Accused of cheating due to the time accounted by Blackboard | |
| 1976 Is it acceptable for a professor to tell male students to not think that they are smarter than female students? | |
| 1977 Citing paywalled articles accessed via illegal web sharing | |
| 1978 How do teachers learn to grade? | |
| 1979 Should I take threats from a former professor seriously? | |
| 1980 Does publishing a paper on arXiv prevent me from submitting it to a non-open access journal? | |
| 1981 How to deal with a student who harasses the (inexperienced) teacher during class? | |
| 1982 How to respond to unfair to write English comments? | |
| 1983 Someone plagiarised my entire paper. What should I do now? | |
| 1984 How to help reduce students anxiety in an oral exam? | |
| 1985 How to deal with a professor who grades assignments and exams incorrectly | |
| 1986 Are results that are derived simply by using more computational power publishable? | |
| 1987 What are the advantages or disadvantages of using LaTeX for writing scientific publications | |
| 1988 How to let a PhD student know that their research is not as good as they think it is | |
| 1989 First author doesnt want a co-author to read the whole paper | |
| 1990 Why are many obviously pointless papers published, or worse studied? | |
| 1991 Can a lecturer force you to learn a specific programming syntax / language? | |
| 1992 Why upload to academic preprint sites like arXiv? | |
| 1993 Lecturer ridiculing me in front of class for making a mistake | |
| 1994 Is there any problem with students seeing faculty naked in university gym? | |
| 1995 Am I being exploited by my supervisor? | |
| 1996 What to answer an author asking me if I reviewed his/her paper? | |
| 1997 Is it ethical to use proprietary (closed-source) software for scientific computation? | |
| 1998 Why does this site give different answers about leaving a bad situation compared to Workplace.SE? | |
| 1999 How to deal with an academic stalker? | |
| 2000 My first authorship is being turned into co-first authorship, what can I do? | |
| 2001 A student forgot to answer an exam question | |
| 2002 Can I, as a reviewer, tell authors to get a native English speaker to proofread their paper? | |
| 2003 How to deal with people looking at their mobile phone during my presentation? | |
| 2004 What is a social strategy I can use to respond to Hows your PhD going? | |
| 2005 What good is engineering research with no practical relevance? | |
| 2006 PhD candidate vs PhD student | |
| 2007 Why do academics frequently write very short email replies? | |
| 2008 Is it valid to modify a students exam grade if you feel they did not earn it? | |
| 2009 Is it appropriate (as a PhD student) to email other researchers asking about some details in their papers? | |
| 2010 Why do researchers need universities? | |
| 2011 Is it acceptable for a professor to ask post-doc student to babysit for free? | |
| 2012 How can I tell if I have simplified my talk too much? | |