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Posted to issues@commons.apache.org by "Ethan Mahintorabi (Jira)" <ji...@apache.org> on 2019/10/29 17:22:00 UTC

[jira] [Created] (MATH-1502) KolmogorovSmirnovTest#exactP value is incorrect in 3.6.1 potential bug

Ethan Mahintorabi created MATH-1502:
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             Summary: KolmogorovSmirnovTest#exactP value is incorrect in 3.6.1 potential bug
                 Key: MATH-1502
                 URL: https://issues.apache.org/jira/browse/MATH-1502
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.6.1
            Reporter: Ethan Mahintorabi


I believe that I have found a bug in the calculation of the exactP value in KolmogorovSmirnovTest.java in version 3.6.1.
 
In version 3.4.1 KolmogorovSmirnovTest#exactP(0.5633587786259542, 3, 3, true) = 0.6
 
Where as
 
In version 3.6.1 KolmogorovSmirnovTest#exactP(0.5633587786259542, 3, 3, true) = 0.09999999999999998
 
 
The approximateP value has stayed the same at ~=0.72. This seems to correspond with the change in methods of calculation in e38bbb9f4191d0d21dea0ba31fdc131b97a5597b
 
[https://github.com/apache/commons-math/commit/e38bbb9f4191d0d21dea0ba31fdc131b97a5597b#diff-34100572fcc8e6537bc7445a0e82b900]
 



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