WFR created MATH-1503:
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             Summary: cumulativeProbability of LevyDistribution returns NaN for 
values out of domain, while others return 0
                 Key: MATH-1503
                 URL: https://issues.apache.org/jira/browse/MATH-1503
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.6.1
            Reporter: WFR


LevyDistribution.cumulativeProbability returns Double.NaN for values that are 
outside of its domain (x < mu in this case), while GammaDistribution returns 
0.0 (for x <= 0). Both cases are hard-coded.{color:#ffc66d}
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A consistent behaviour would be desirable.



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