[
https://issues.apache.org/jira/browse/ACCUMULO-2494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13946629#comment-13946629
]
Mike Drob commented on ACCUMULO-2494:
-------------------------------------
[~elserj] - No, my next question was going to be how this ever worked, since I
thought we already had a dependency on commons-math and that's why this change
was safe to include. However, we only had it in the parent dependency
management section, and an explicit dependency under test, so I'm not sure how
this even compiled on my machine. Probably a transitive dependency somewhere...
Looks like [~ecn] beat me to adding it to the pom, but I'll verify the tarball
and generated RPMs/DEBs as well.
> 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
> Assignee: 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
--
This message was sent by Atlassian JIRA
(v6.2#6252)
