[jira] [Assigned] (MAHOUT-1753) First and second moment routines

["Dmitriy Lyubimov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov reassigned MAHOUT-1753:
----------------------------------------

    Assignee: Dmitriy Lyubimov

> 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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