Accumulo
  1. Accumulo
  2. ACCUMULO-2494

Stat calculation of STDEV may be inaccurate

    Details

    • Type: Bug Bug
    • Status: Resolved
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 1.5.2, 1.6.0
    • Component/s: client
    • Labels:
      None

      Description

      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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            People

            • Assignee:
              Mike Drob
              Reporter:
              Mike Drob
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              Dates

              • Created:
                Updated:
                Resolved:

                Development