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Date: Sat, 4 Feb 2012 06:35:53 +0000 (UTC)
From: =?utf-8?Q?S=C3=A9bastien_Brisard_=28Reopened=29_=28JIRA=29?=
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Subject: [jira] [Reopened] (MATH-718) inverseCumulativeProbability of
 BinomialDistribution returns wrong value for large trials.
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     [ https://issues.apache.org/jira/browse/MATH-718?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

S=C3=A9bastien Brisard reopened MATH-718:
------------------------------------


Sorry, I only meant to postpone this issue.
               =20
> inverseCumulativeProbability of BinomialDistribution returns wrong value =
for large trials.
> -------------------------------------------------------------------------=
-----------------
>
>                 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
>             Fix For: 3.1, 4.0
>
>
> The inverseCumulativeProbability method of the BinomialDistributionImpl c=
lass returns wrong value for large trials.  Following code will be reproduc=
e the problem.
> {{System.out.println(new BinomialDistributionImpl(1000000, 0.5).inverseCu=
mulativeProbability(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 cumulative=
Probability method returns Infinity, not NaN.  As the result the checkedCum=
ulativeProbability method doesn't work as expected.

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