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https://issues.apache.org/jira/browse/MATH-1233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16000769#comment-16000769
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Rob Tompkins commented on MATH-1233:
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Gilles - do you think we should deprecate the old method or simply change the
signature because we're going from 3.X to 4.X? It feels like that could be
abrupt with out the forewarning that deprecation provides.
> Uncommon wilcoxon signed-rank p-values
> --------------------------------------
>
> Key: MATH-1233
> URL: https://issues.apache.org/jira/browse/MATH-1233
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Icaro Cavalcante Dourado
> Assignee: Rob Tompkins
> Fix For: 4.0
>
> Attachments: MATH-1233-test.patch
>
>
> This implementation in WilcoxonSignedRankTest looks weird. For equal vectors,
> the correct pValue should be 1, because it is the probability of the vectors
> to come from same population.
> On the opposite, this implementation returns ~0 for equal vectors. So we need
> to analyze the returned pValue > significanceLevel to reject H0 hypothesis,
> while in R and many others tools we perform the opposite: pValue <=
> significanceLevel gives us an argument to reject null hypothesis.
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