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

        Issue Links

          Activity

          Mike Drob created issue -
          Keith Turner made changes -
          Field Original Value New Value
          Remote Link This issue links to "Review (Web Link)" [ 14623 ]
          Mike Drob made changes -
          Fix Version/s 1.5.2 [ 12326272 ]
          Fix Version/s 1.6.0 [ 12322468 ]
          Mike Drob made changes -
          Status Open [ 1 ] Resolved [ 5 ]
          Resolution Fixed [ 1 ]
          Josh Elser made changes -
          Resolution Fixed [ 1 ]
          Status Resolved [ 5 ] Reopened [ 4 ]
          Josh Elser made changes -
          Assignee Mike Drob [ mdrob ]
          Mike Drob made changes -
          Link This issue incorporates ACCUMULO-2546 [ ACCUMULO-2546 ]
          Mike Drob made changes -
          Status Reopened [ 4 ] Resolved [ 5 ]
          Resolution Fixed [ 1 ]

            People

            • Assignee:
              Mike Drob
              Reporter:
              Mike Drob
            • Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved:

                Development