[R] fitness of regression tree: how to measure???

2010-04-01 Thread vibha patel 
Hello,

I'm using rpart function for creating regression trees.
now how to measure the fitness of regression tree???

thanks n Regards,
Vibha

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Re: [R] fitness of regression tree: how to measure???

2010-04-01 Thread Frank E Harrell Jr 

vibha patel wrote:

Hello,

I'm using rpart function for creating regression trees.
now how to measure the fitness of regression tree???

thanks n Regards,
Vibha


If the sample size is less than 20,000, assume that the tree is a 
somewhat arbitrary representation of the relationships in the data and 
that the form of the tree will not replicate in future datasets.


Frank

--
Frank E Harrell Jr   Professor and ChairmanSchool of Medicine
 Department of Biostatistics   Vanderbilt University

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