validate proportion inputs in proportion_difference - #1185
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rasbt merged 5 commits intoAug 5, 2026
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proportion_difference silenlty returned (nan, nan) (with a RuntimeWarning) when a proportion was outside [0, 1], for e.g. proportion_difference(1.5, 0.3, 50). This adds validation that raises a clear ValueError when proportion_1 or proportion_2 is not in [0, 1] — consistent with the input checks already in mcnemar and cochrans_q. Valid-input behavior is unchanged; a unit test was added.