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From "Mikkel Meyer Andersen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-431) New tests: Wilcoxon signed-rank test and Mann-Whitney U
Date Sat, 06 Nov 2010 13:47:42 GMT

     [ https://issues.apache.org/jira/browse/MATH-431?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikkel Meyer Andersen updated MATH-431:
---------------------------------------

    Attachment: WilcoxonSignedRankTestImpl.java
                WilcoxonSignedRankTest.java

Proposal for the Wilcoxon signed rank test:
double x[] = {125, 115, 130, 140, 140, 115, 140, 125, 140, 135};
double y[] = {110, 122, 125, 120, 140, 124, 123, 137, 135, 145};

And with R:
x <- c(125, 115, 130, 140, 140, 115, 140, 125, 140, 135)
y <- c(110, 122, 125, 120, 140, 124, 123, 137, 135, 145)
		    
wilcox.test(x, y, alternative = "two.sided", mu = 0, paired = TRUE, exact = FALSE, correct
= FALSE)

The p-values differs slightly.

> 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, WilcoxonSignedRankTest.java,
WilcoxonSignedRankTestImpl.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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