tTestIS: Allow rank biserial correlation to be negative #403
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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.
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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.
Fixes jamovi/jamovi#1500