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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1381) BinomialTest P-value > 1
Date Wed, 31 Aug 2016 08:11:20 GMT

    [ https://issues.apache.org/jira/browse/MATH-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15451537#comment-15451537
] 

Gilles commented on MATH-1381:
------------------------------

Having just looked at your proposed, I can't be sure that it fixes a potential bug in the
computation.
The wrong value being so much larger than the expected 1, it seems quite possible that wrong
results
could also be lower than 1, which your fix wouldn't fix.

At first sight, it would be useful to test a whole range of values against the results provided
by another implementation.

> BinomialTest P-value > 1
> ------------------------
>
>                 Key: MATH-1381
>                 URL: https://issues.apache.org/jira/browse/MATH-1381
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Wang Qiang
>
> When I use the Binomial Test, I got p-value > 1 for two sided check.
> Example:
> (new BinomialTest()).binomialTest(200, 200, 0.9950429, AlternativeHypothesis.TWO_SIDED)
== 1.3701357550780435
> In my case, if the expected p-value is 1 (calculated by package in other language, scipy
in this case), the p-value returned could be > 1



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