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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate
Date Wed, 19 Mar 2014 21:31:00 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13941022#comment-13941022
] 

Keith Turner commented on ACCUMULO-2494:
----------------------------------------

-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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