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https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941022#comment-13941022
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Keith Turner commented on ACCUMULO-2494:
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-0 I am not strongly opposed to fixing this particular issue in 1.5.X. I am
concerned about making lots of changes of this nature. I think doing this
increases the chances of introducing a new ciritcal bug in 1.5.X lines. I am
wondering when you draw the line. If I had 20 issues like this in front of me
all at once I would probably make a different decisions than looking at those
same issues 1 per week over 20 weeks.
> 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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