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Posted to dev@mahout.apache.org by "Suneel Marthi (JIRA)" <ji...@apache.org> on 2013/12/04 22:04:35 UTC

[jira] [Resolved] (MAHOUT-1368) Convert OnlineSummarizer to use the new TDigest

     [ https://issues.apache.org/jira/browse/MAHOUT-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suneel Marthi resolved MAHOUT-1368.
-----------------------------------

    Resolution: Fixed
      Assignee: Suneel Marthi

Patch committed to trunk.

> Convert OnlineSummarizer to use the new TDigest
> -----------------------------------------------
>
>                 Key: MAHOUT-1368
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1368
>             Project: Mahout
>          Issue Type: Bug
>            Reporter: Ted Dunning
>            Assignee: Suneel Marthi
>             Fix For: 0.9
>
>         Attachments: MAHOUT-1368.patch
>
>
> The new TDigest provides better accuracy for quartile estimation as well as producing any other quantile you might like.  The current quartile estimation of the OnlineSummarizer fails for highly skewed distributions and can't really be extended to provide other quantiles.  The TDigest handles all of this.



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