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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 17:28:48 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13945387#comment-13945387
] 

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

Commit 0dc92ca1288f521cbbeeb8bbd266fa922c845d90 in accumulo's branch refs/heads/1.5.2-SNAPSHOT
from [~mdrob@cloudera.com]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=0dc92ca ]

ACCUMULO-2494 Delegate math to commons-math


> 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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