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https://issues.apache.org/jira/browse/MATH-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14060050#comment-14060050
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Luc Maisonobe commented on MATH-1120:
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The patch from June 27th has been applied, with a few changes, as the patch did
not include the factored out classes. The classes were therefore extracted from
the previous version and API adapted for the select method (which now provides
the arrays to work on).
Thanks for the patch
As explained on the mailing list, the problem for FIXED NaNStrategy is still
there, and I still want to look at it.
> Need Percentile computations that can be matched with standard spreadsheet
> formula
> ----------------------------------------------------------------------------------
>
> Key: MATH-1120
> URL: https://issues.apache.org/jira/browse/MATH-1120
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.2
> Reporter: Venkatesha Murthy TS
> Labels: Percentile
> Fix For: 4.0
>
> Attachments: 18-jun-percentile-with-estimation-patch,
> 27-jun-refactored-kth-pivoting.patch, excel-percentile-patch,
> percentile-with-estimation-patch, r-output.txt
>
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> The current Percentile implementation assumes and hard-codes the quantile pth
> position as
> p * (N+1)/100 and provides a kth selected value.
> However if we need to verify compare/contrast with standard statistical tools
> such as say MS Excel; it would be good to provide an extensible way of
> morphing this selection of position than hard code.
> For example in order to generate the percentile closely matching with MS
> Excel the position required may be [p*(N-1)/100]+1.
> Please let me know if i could submit this as a patch.
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