[R] how to measure accuracy of regression tree?

Frank E Harrell Jr f.harrell at Vanderbilt.Edu
Fri Mar 26 15:05:09 CET 2010

vibha patel wrote:
> Hello,
> for constructing regression tree, I am using rpart function.
> now after dividing dataset in to training and testing,
> I'm using predict for forecasting.

Such data splitting yields unreliable validations unless N > 20,000.

> how to measure accuracy of the predicted data?
> Thanks and Regards,
> Vibha.
> 	[[alternative HTML version deleted]]
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Frank E Harrell Jr   Professor and Chairman        School of Medicine
                      Department of Biostatistics   Vanderbilt University

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