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From "Sriram Natarajan (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (MATH-1185) Tail probability drops to zero beyond 10e-17 ?
Date Tue, 06 Jan 2015 16:00:35 GMT

    [ https://issues.apache.org/jira/browse/MATH-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14266301#comment-14266301
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Sriram Natarajan edited comment on MATH-1185 at 1/6/15 3:59 PM:
----------------------------------------------------------------

Point noted re CDF vs. Q (1- CDF). So this library will have the same issue then (resolution
in doubles close to 1).  If I find anything of interest in the tests, I will update this thread.

I finally got the point re doubles close to 1, it took a while ;-)


was (Author: acmuser):
Point noted re CDF vs. Q (1- CDF). So this library will have the same issue then (resolution
in doubles close to 1).  If I find anything of interest in the tests, I will update this thread.

> 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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