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https://issues.apache.org/jira/browse/SPARK-10641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14944485#comment-14944485
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Seth Hendrickson commented on SPARK-10641:
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My apologies, I haven't been able to devote much time to this lately. To your
point, one of the bigger decisions for this PR we'll be how to combine these
functions with other aggregates, since online algorithms for higher order
statistical moments require the calculation of all the lower order moments. I
can have a WIP PR up by tomorrow, so we can get some discussion going. This PR
will also be affected by several other ongoing PRs.
> skewness and kurtosis support
> -----------------------------
>
> Key: SPARK-10641
> URL: https://issues.apache.org/jira/browse/SPARK-10641
> Project: Spark
> Issue Type: New Feature
> Components: ML, SQL
> Reporter: Jihong MA
> Assignee: Seth Hendrickson
>
> Implementing skewness and kurtosis support based on following algorithm:
> https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Higher-order_statistics
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