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From "Siarhei Khamenka (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-1086) Incorrect results from BinomialConfidenceInterval#getWilsonScoreInterval
Date Sat, 11 Jan 2014 08:00:55 GMT

     [ https://issues.apache.org/jira/browse/MATH-1086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siarhei Khamenka resolved MATH-1086.
------------------------------------

    Resolution: Not A Problem

Sorry, I compared values calculated with confidence interval 0.5 and 0.95. So obviously they
were different. 

> 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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