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https://issues.apache.org/jira/browse/SPARK-13508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15168913#comment-15168913
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Sean Owen commented on SPARK-13508:
-----------------------------------

(Please don't reopen unless the discussion has materially changed.)
stdev = sqrt(variance); I'm not even sure it's worth a helper method.

> For direct retrival of Standard Deviation for Anlaytics
> -------------------------------------------------------
>
>                 Key: SPARK-13508
>                 URL: https://issues.apache.org/jira/browse/SPARK-13508
>             Project: Spark
>          Issue Type: New Feature
>          Components: MLlib
>         Environment: Operating System:ubuntu
> Software : Spark
> Harware Specification:Normal
>            Reporter: Sidharth Rajeev
>            Priority: Minor
>              Labels: easyfix, newbie
>   Original Estimate: 0.05h
>  Remaining Estimate: 0.05h
>
> As part of easying up the analytical capabilities, I would like to add the 
> standard deviation as such. As of now variance is directly available. Its 
> square root will give the standard deviation. But as direct functionality it 
> will save the time of the data analysts/scientists.



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