length fix grouping

app.py

@@ -141,8 +141,8 @@ def prepare_grouped_data(path, stat_name, grouping, top_k, direction):
         keys = heapq.nlargest(top_k, totals, key=totals.get)
 
     elif direction == "Most frequent (length)":
-        n_docs = load_stats(path, "n_docs", grouping)
-        totals = {key: value.total for key, value in n_docs.items()}
+        n_docs = load_stats(path, "length", grouping)
+        totals = {key: value.total * value.mean for key, value in n_docs.items()}
         keys = heapq.nlargest(top_k, totals, key=totals.get)
     else:
         keys = heapq.nsmallest(top_k, means, key=means.get)