inverseCumulativeProbability of BinomialDistribution returns wrong value for
large trials.
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Key: MATH-718
URL: https://issues.apache.org/jira/browse/MATH-718
Project: Commons Math
Issue Type: Bug
Affects Versions: 2.2, 3.0
Reporter: Yuji Uchiyama
The inverseCumulativeProbability method of the BinomialDistributionImpl class
returns wrong value for large trials. Following code will be reproduce the
problem.
{{System.out.println(new BinomialDistributionImpl(1000000,
0.5).inverseCumulativeProbability(0.5));}}
This returns 499525, though it should be 499999.
I'm not sure how it should be fixed, but the cause is that the
cumulativeProbability method returns Infinity, not NaN. As the result the
checkedCumulativeProbability method doesn't work as expected.
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