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From "Mikkel Meyer Andersen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-431) New tests: Wilcoxon signed-rank test and Mann-Whitney U
Date Sat, 06 Nov 2010 13:43:41 GMT

    [ https://issues.apache.org/jira/browse/MATH-431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928969#action_12928969
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Mikkel Meyer Andersen commented on MATH-431:
--------------------------------------------

Proposal for the Mann-Whitney U.

Test can e.g. be made with this:
double x2[] = {19, 22, 16, 29, 24};
double y2[] = {20, 11, 17, 12};

x <- c(19, 22, 16, 29, 24)
y <- c(20, 11, 17, 12)
wilcox.test(x, y, alternative = "two.sided", mu = 0, paired = FALSE, exact = FALSE, correct
= FALSE)

The p-value is not exactly equal.

> New tests: Wilcoxon signed-rank test and Mann-Whitney U
> -------------------------------------------------------
>
>                 Key: MATH-431
>                 URL: https://issues.apache.org/jira/browse/MATH-431
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Mikkel Meyer Andersen
>            Assignee: Mikkel Meyer Andersen
>            Priority: Minor
>         Attachments: MannWhitneyUTest.java, MannWhitneyUTestImpl.java
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> Wilcoxon signed-rank test and Mann-Whitney U are commonly used non-parametric statistical
hypothesis tests (e.g. instead of various t-tests when normality is not present).

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