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https://issues.apache.org/jira/browse/MATH-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352783#comment-15352783
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Gilles commented on MATH-1380:
------------------------------
Thanks for the report.
bq. Patch available with additional tests.
Please attach them to this page.
> LoessInterpolator can calculate median residual for robustness iterations
> incorrectly
> -------------------------------------------------------------------------------------
>
> Key: MATH-1380
> URL: https://issues.apache.org/jira/browse/MATH-1380
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.6.1
> Reporter: Richard Wilkinson
> Priority: Minor
>
> When LoessInterpolator.smooth determines the median residual to use in
> weighting points when performing robustness iterations its calculation is
> only strictly correct for odd numbers of points. For even numbers it should
> take the mean of the central two residuals. While this may not generally make
> a large difference it hinders comparison with other implementations (such as
> R loess) for testing.
> Patch and additional tests available.
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