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Posted to issues@commons.apache.org by "Brian (JIRA)" <ji...@apache.org> on 2014/01/20 23:56:19 UTC

[jira] [Commented] (MATH-287) Add support for weighted descriptive statistics

    [ https://issues.apache.org/jira/browse/MATH-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876945#comment-13876945 ] 

Brian commented on MATH-287:
----------------------------

I also would like this for SummaryStatistics and/or storeless ones as well.  I have to calculate weighted statistics from a large set for a current project and wanted to use the commons library for streaming calculations - I don't want to have to copy all the values into memory.

> Add support for weighted descriptive statistics
> -----------------------------------------------
>
>                 Key: MATH-287
>                 URL: https://issues.apache.org/jira/browse/MATH-287
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 2.0
>            Reporter: Matthew Rowles
>            Priority: Minor
>         Attachments: weightTests.patch, weighted.patch
>
>
> Add support for weighted descriptive statistics, such as weighted variance.
> An example method call would be Variance.evaluate(double[] values, double[] weights, int begin, int length)
> - Suggested by  mickeydog@taosnet.com on the mailing list.



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