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https://issues.apache.org/jira/browse/MAHOUT-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suneel Marthi closed MAHOUT-1753.
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> First and second moment routines
> ---------------------------------
>
> Key: MAHOUT-1753
> URL: https://issues.apache.org/jira/browse/MAHOUT-1753
> Project: Mahout
> Issue Type: Blog - New Blog Request
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> R analogs: mean(), rowCols(), rowMeans(), variance(), sd().
> Since it presents an efficiency problem to compute second and first moment as
> two different routines, this issue suggest to unify computation of both first
> and second moments in the same routine.
> For completeness, we do both in-core and distriuted variations, by convention
> prepending distributed versions with "d" letter:
> colMeanVars()
> colMeanStdevs()
> dcolMeanVars()
> dcolMeanStdevs()
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