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https://issues.apache.org/jira/browse/MATH-282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764514#action_12764514
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Phil Steitz commented on MATH-282:
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The problem in Gamma.regularizedGammaP reported here is also causing incorrect
results from PoissonDistributionImpl#cumulativeProbability. The (currently
disabled) test case, testCumulativeProbabilitySpecial() in
PoissonDistributionTest illustrates the problem. For some (not all) large
lambda and some (not all) x in (0.9 * lambda, lambda), NaN or zero cumulative
probabilities are returned.
> ChiSquaredDistributionImpl.cumulativeProbability > 1
> ----------------------------------------------------
>
> Key: MATH-282
> URL: https://issues.apache.org/jira/browse/MATH-282
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 1.0, 1.1, 1.2, 2.0
> Environment: called from Scala code
> Reporter: Adam Kiezun
> Fix For: 2.1
>
> Attachments: math-282.patch
>
>
> Calling
> new ChiSquaredDistributionImpl(1.0).cumulativeProbability(66.41528551683048)
> returns 1.000000000000004, which is bogus (should never be > 1)
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