Update README.md

README.md

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 In these files there are following fields:
 
 1) PARAMETERS OF SAMPLE SIMULATION
-- **sample** is a type of the sample (train, val, test). These field is need to split dataset into train-validate-test samples for ML-model training;
+- **sample** is a type of the sample (train, val, test). This field is used to split dataset into train-validate-test samples for ML-model training;
 - **H0_H1** is a true hypothesis: if **H0**, then test statistics were simulated under S1(t)=S2(t); if **H1**, then test statistics were simulated under S1(t)≠S2(t);
 - **Hi** is an alternative hypothesis (H01-H09, H11-H19, or H21-H29) for S1(t) and S2(t). Detailed description of these alternatives can be found in the paper;
 - **n1** is the size of the sample 1;