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Posted to issues@commons.apache.org by "Siarhei Khamenka (JIRA)" <ji...@apache.org> on 2014/01/10 16:49:02 UTC

[jira] [Created] (MATH-1086) Incorrect results from BinomialConfidenceInterval#getWilsonScoreInterval

Siarhei Khamenka created MATH-1086:
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             Summary: 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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