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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-2494) Stat calculation of STDEV may be inaccurate
Date Tue, 18 Mar 2014 18:49:42 GMT
Mike Drob created ACCUMULO-2494:
-----------------------------------

             Summary: 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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