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pairing mean_diff with Mann-Whitney test #92

@tmchartrand

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@tmchartrand

It seems to me that there's a conceptual issue with the default behavior shown in the tutorial: the documentation there states "By default, DABEST will report the two-sided p-value of the most conservative test that is appropriate for the effect size.", which in the example means that the mean_diff effect size reports a Mann-Whitney test p-value.
However, the Mann-Whitney test is fundamentally unrelated to the mean difference in general, corresponding to the median difference instead. It's possible that a positive mean difference and negative median difference could both be valid conclusions for the right data!
Maybe the defaults could restrict to pairing mean- and median-based effect sizes and tests?

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