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Date: Tue, 6 Jan 2015 10:56:34 +0000 (UTC)
From: "Gilles (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (MATH-1185) Tail probability drops to zero
 beyond 10e-17 ?
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    [ https://issues.apache.org/jira/browse/MATH-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265953#comment-14265953 ] 

Gilles commented on MATH-1185:
------------------------------

bq. \[...\] q computation on Line 7126

>From the name it seems to be the CDF, whereas by "q" I mean "1 - CDF".

bq. A large number of tests are in the prob_prb.c

Can you run the tests and let us know whether you'd conclude there is room for improving the CM implementation?


> Tail probability drops to zero beyond 10e-17 ?
> ----------------------------------------------
>
>                 Key: MATH-1185
>                 URL: https://issues.apache.org/jira/browse/MATH-1185
>             Project: Commons Math
>          Issue Type: Wish
>    Affects Versions: 3.3, 3.4
>            Reporter: Sriram Natarajan
>            Priority: Minor
>
> This could be a  simple question, In which case I can expect a clarification. If this is the wrong place to post such a question, let me know.
> OS: Windows 8.1, Java 1.8.0_25
> ChiSquaredDistribution chisq = new ChiSquaredDistribution(23)
> 1.0 - chisq.cumulativeProbability(130) is  1.1102230246251565E-16
> 1.0 - chisq.cumulativeProbability(131) is  0.0  
> Am pretty sure it is not a formatting issue.  Is there a reason why the tail drops to zero at this point?


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