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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1185) Tail probability drops to zero beyond 10e-17 ?
Date Fri, 09 Jan 2015 17:46:35 GMT

    [ https://issues.apache.org/jira/browse/MATH-1185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14271592#comment-14271592
] 

Phil Steitz commented on MATH-1185:
-----------------------------------

I agree this is a topic for the dev list to start and possibly a second issue to add direct
tail probability computations.  This issue should probably be closed as INVALID, as there
is no evidence here that what is advertised and computed today is incorrect / badly inaccurate.


> 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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