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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1086) Incorrect results from BinomialConfidenceInterval#getWilsonScoreInterval
Date Sat, 11 Jan 2014 19:47:51 GMT

    [ https://issues.apache.org/jira/browse/MATH-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868863#comment-13868863
] 

Phil Steitz commented on MATH-1086:
-----------------------------------

Thomas - agree that is a nice design.  I would be +1 for this change, but it would be nice
to then expose static methods somewhere to just get the intervals.  Not sure what the best
place for these would be.  Maybe best to take this to commons-dev.

> Incorrect results from BinomialConfidenceInterval#getWilsonScoreInterval
> ------------------------------------------------------------------------
>
>                 Key: MATH-1086
>                 URL: https://issues.apache.org/jira/browse/MATH-1086
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.3
>            Reporter: Siarhei Khamenka
>             Fix For: 3.3
>
>
> It looks like BinomialConfidenceInterval#getWilsonScoreInterval produces not accurate
results for interval lower bound.
> E.g. for input (10,9,0.95) it returns 0.818 instead of 0.596; 
>        for input (10,10,0.95) it returns 0.856 instead of 0.722.
> Used also http://epitools.ausvet.com.au/content.php?page=CIProportion&SampleSize=10&Positive=9&Conf=0.95&Digits=3
and http://www.measuringusability.com/wald.htm to verify it.



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