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Posted to notifications@accumulo.apache.org by "Mike Drob (JIRA)" <ji...@apache.org> on 2014/03/24 18:32:44 UTC

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

     [ https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike Drob resolved ACCUMULO-2494.
---------------------------------

    Resolution: Fixed

> 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
>             Fix For: 1.5.2, 1.6.0
>
>
> 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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