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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate
Date Mon, 24 Mar 2014 20:44:43 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945663#comment-13945663
] 

ASF subversion and git services commented on ACCUMULO-2494:
-----------------------------------------------------------

Commit ce6a7216d3d41966f15c3be2d2099aac1797124f in accumulo's branch refs/heads/1.5.2-SNAPSHOT
from [~ecn]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=ce6a721 ]

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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