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Fix rank biserial correlation sign for Mann-Whitney U test #476

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@thimo72 thimo72 commented Aug 10, 2025

Changed RBC calculation from
rbc = 1 - (2 * uval) / diff.size
to
rbc = 2 * cles - 1

This makes RBC directional and consistent with CLES, so that RBC > 0 when x > y.

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