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

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

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3 changes: 1 addition & 2 deletions src/pingouin/nonparametric.py
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Expand Up @@ -299,8 +299,7 @@ def mwu(x, y, alternative="two-sided", **kwargs):
cles = 1 - cles if alternative == "less" else cles

# Effect size 2: rank biserial correlation (Wendt 1972)
uval_y = x.shape[0] * y.shape[0] - uval_x
rbc = 1 - (2 * uval_y) / diff.size # diff.size = x.size * y.size
rbc = 2 * cles - 1

# Fill output DataFrame
stats = pd.DataFrame(
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