[jira] [Created] (MATH-644) for the class of hyper-geometric distribution, for some number the method "upperCumulativeProbability" return a probability greater than 1 which is impossible.

Fri, 12 Aug 2011 23:29:00 -0700 

for the class of hyper-geometric distribution, for some number the method 
"upperCumulativeProbability" return a probability greater than 1 which is 
impossible.  
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                 Key: MATH-644
                 URL: https://issues.apache.org/jira/browse/MATH-644
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 2.2
            Reporter: marzieh
            Priority: Minor
             Fix For: 2.2


In windows 7, I used common.Math library. I used class 
"HypergeometricDistributionImpl" and method "upperCumulativeProbability" of 
zero for distribution and the return value is larget than 1. the following code 
is working error. 

HypergeometricDistributionImpl u = new HypergeometricDistributionImpl(14761461, 
1035 ,1841 );
System.out.println(u.upperCumulativeProbability(0))

Thanks

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