[jira] [Commented] (MATH-1131) Kolmogorov-Smirnov Tests takes 'forever' on 10,000 item dataset

["Schalk W. Cronjé (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14082369#comment-14082369 ] 

Schalk W. Cronjé commented on MATH-1131:
----------------------------------------

Befoer closing, it would be good to have a note in the javadoc to indicate over which value of N samples, performance will become an issue. It will prevent users like me from falling into a pit :)

> Kolmogorov-Smirnov Tests takes 'forever' on 10,000 item dataset
> ---------------------------------------------------------------
>
>                 Key: MATH-1131
>                 URL: https://issues.apache.org/jira/browse/MATH-1131
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.3
>         Environment: Java 8
>            Reporter: Schalk W. Cronjé
>         Attachments: 1.txt, MATH-1131.patch, ReproduceKsIssue.groovy, ReproduceKsIssue.java
>
>
> I have code simplified to the following:
>     KolmogorovSmirnovTest kst = new KolmogorovSmirnovTest();
>     NormalDistribution nd = new NormalDistribution(mean,stddev);
>     kst.kolmogorovSmirnovTest(nd,dataset)
> I find that for my dataset of 10,000 items, the call to kolmogorovSmirnovTest takes 'forever'. It has not returned after nearly 15minutes and in one my my tests has gone over 150MB in  memory usage. 



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