[R] Question on: Random Forest Variable Importance for RegressionProblems

Liaw, Andy andy_liaw at merck.com
Wed Apr 28 18:21:01 CEST 2010

I would have thought that the help page for importance() is an (the?) obvious place to look...

If that description is not clear, please let me know which part isn't clear to you.


From: Mareike Lies
> I am trying to use the package RandomForest performing regression.
> The variable importance estimates are given as:  "%IncMSE"    
>  and      
> "IncNodePurity"
> Can anyone explain me what these refer to and how they are calculated?
> I found a lot of information on variable importance measures for 
> classification problems, but nothing on regression.
> Thanks a lot.
> Mareike
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