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Numerically more stable computation of the p-values for the two-sample Kolmogorov-Smirnov test

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arxiv 2102.08037 v2 pith:4Z765D3P submitted 2021-02-16 stat.CO

Numerically more stable computation of the p-values for the two-sample Kolmogorov-Smirnov test

classification stat.CO
keywords testtwo-samplecomputationkolmogorov-smirnovp-valuesadvancesarticleavoids
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The two-sample Kolmogorov-Smirnov test is a widely used statistical test for detecting whether two samples are likely to come from the same distribution. Implementations typically recur on an article of Hodges from 1957. The advances in computation speed make it feasible to compute exact p-values for a much larger range of problem sizes, but these run into numerical stability problems from floating point operations. We provide a simple transformation of the defining recurrence for the two-side two-sample KS test that avoids this.

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