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From "Ted Dunning (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-943) Improbe the way to make the split point on DF.
Date Wed, 11 Jan 2012 12:43:45 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184024#comment-13184024
] 

Ted Dunning commented on MAHOUT-943:
------------------------------------

Also, that isn't a particularly good way to compute variance in the first place.

Better to use Welford's method.  Better, use something like the OnlineSummarizer.


                
> Improbe the way to make the split point on DF.
> ----------------------------------------------
>
>                 Key: MAHOUT-943
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-943
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Classification
>            Reporter: Ikumasa Mukai
>              Labels: DecisionForest
>
> The numericalSplit() on OptIgSplit adopts the way to regard the attribute value having
the best IG as the split point.
> But I think this is a little too strict and think it is better on some situation to 
use the average value which is calced with the best IG value and the 2nd value.

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