[R] Question on cross-validation in rpart

Brian Sanborn brian at ndr.com
Thu Nov 2 15:28:44 CET 2006

Hi R folks,

I am using R version 2.2.1 for Unix. I am exploring the rpart function, 
in particular the rpart.control parameter. I have tried using different 
values for xval (0, 1, 10, 20) leaving other parameters constant but I 
receive the same tree after each run. Is the10 fold cross-validation 
default still running every time? I would expect the trees to change at 
least a little when I change the number of folds in the cross-validation 
but this is not the case in my tests. Any advice would be greatly 


Brian Sanborn
brian at ndr.com

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