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Posted to notifications@accumulo.apache.org by "Keith Turner (JIRA)" <ji...@apache.org> on 2014/03/18 20:12:45 UTC

[jira] [Commented] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate

    [ https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939668#comment-13939668 ] 

Keith Turner commented on ACCUMULO-2494:
----------------------------------------

This issue is about org.apache.accumulo.core.util.Stat

> Stat calculation of STDEV may be inaccurate
> -------------------------------------------
>
>                 Key: ACCUMULO-2494
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2494
>             Project: Accumulo
>          Issue Type: Bug
>          Components: client
>            Reporter: Mike Drob
>
> The math is sound, but it is susceptible to rounding errors. We should address that.
> See http://www.strchr.com/standard_deviation_in_one_pass and http://www.cs.berkeley.edu/~mhoemmen/cs194/Tutorials/variance.pdf



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