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From "Mike Drob (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate
Date Wed, 19 Mar 2014 20:11:48 GMT


Mike Drob commented on ACCUMULO-2494:

re: fix version

The latest version of the patch delegates all calculations in Stat to commons-math. However,
1.4 does not yet have a dependency on commons-math so I am hesitant to introduce one. [~busbey]
suggested on RB that we apply a known issue note to 1.4 (presumably javadoc?) and then apply
the code change in 1.5 and newer.

[~kturner] - You expressed some concern previously, can you articulate it further?

> Stat calculation of STDEV may be inaccurate
> -------------------------------------------
>                 Key: ACCUMULO-2494
>                 URL:
>             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 and

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