Commits on May 31, 2024

1. tTestIS: Allow rank biserial correlation to be negative …

   Rank biserial correlation previously used the given test-statistic
   (the Mann-Whitney U) to calculate the rank biserial correlation.
   However, because the Mann-Whitney U always takes the smallest of the
   two calculated Us this means that the rank biserial correlation is
   always positive and therefore doesn't indicate directionality of the
   effect. This commit fixes this.

   

   raviselker committed May 31, 2024
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