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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