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https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945534#comment-13945534
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ASF subversion and git services commented on ACCUMULO-2494:
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Commit c6163b4c4554996c928bd4be353113f6fc806493 in accumulo's branch
refs/heads/master from [~ecn]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=c6163b4 ]
ACCUMULO-2494 fix rat check failure
> 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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