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https://issues.apache.org/jira/browse/MATH-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16215563#comment-16215563
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Phil Steitz commented on MATH-1361:
-----------------------------------
This is the result of sloppy test implementation (by me). The TiesRandom
strategy assigns ranks randomly among the applicable ranks, so the expected
values are in fact stochastic. To eliminate seed dependency, the expected
values for ties need to be allowed to vary over the possible ranks. One way to
do that is the fix that I applied to Hipparchus for this issue
[https://github.com/Hipparchus-Math/hipparchus/commit/9cc199a7c7b2051a02bd1db060caf43a00748f2b].
> "NaturalRankingTest" broken?
> ----------------------------
>
> Key: MATH-1361
> URL: https://issues.apache.org/jira/browse/MATH-1361
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6.1
> Reporter: Gilles
> Labels: test
> Fix For: 4.0
>
>
> As reported on the ["dev" ML|http://markmail.org/message/2oqkvx33arjj34lz],
> the test method
> {noformat}
> testNaNsFixedTiesRandom()
> {noformat}
> reports failure for more than 96 out of 100 seed values.
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