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FAQ: Why is the Mann-Whitney significant when the medians are equal? edit / delete

A nice example of why the rank-sum test *doesn't* test whether the medians are the same. (Unless the distributions are otherwise very similar.)

to median non-parametric significance statistics ... on 26 March 2014

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- median | |

1 | + non-parametric |

1 | + significance |

1 | + statistics |

tasty by Adam Sampson.