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Kruskal-Wallis test
From @bergel on March 4, 2016 11:39
Useful to analyze differences in median values between samples. This is necessary to do some controlled experiments. https://en.wikipedia.org/wiki/Kruskal%E2%80%93Wallis_one-way_analysis_of_variance
Copied from original issue: SergeStinckwich/SciSmalltalk#24