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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate
Date Mon, 24 Mar 2014 17:32:43 GMT

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

Mike Drob updated ACCUMULO-2494:
--------------------------------

    Fix Version/s: 1.6.0
                   1.5.2

> 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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