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Posted to issues@commons.apache.org by "Mathijs Vogelzang (JIRA)" <ji...@apache.org> on 2017/06/21 07:30:00 UTC

[jira] [Created] (MATH-1421) WilsonConfidenceInterval returning negative values

Mathijs Vogelzang created MATH-1421:
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             Summary: WilsonConfidenceInterval returning negative values
                 Key: MATH-1421
                 URL: https://issues.apache.org/jira/browse/MATH-1421
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.6.1
            Reporter: Mathijs Vogelzang


Wilson confidence intervals sometimes return negative values as the lower bound, e.g.
IntervalUtils.getWilsonScoreInterval(19436, 0, 0.95).getLowerBound() returns -1.3549849074815073E-20

This is causing assertion fails in our code, which we have fixed it now by wrapping the confidence score bounds in Math.max(0, Math.min(1, bound)) until the method doesn't return wrong results anymore.



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