Kim, The "x" in "xerror" and "xstd" stands for cross validation. But you have specified no cross validations, xval=0.
Try: model <- rpart(Product ~ ., data=trainData, control=rpart.control(minsplit=50, cp=0.002)) model$cptable Jean On Tue, Feb 3, 2015 at 7:09 AM, Kim C. <minorthre...@hotmail.com> wrote: > Hello all, > I'm making a decision tree with the rpart package. I want to prune the > tree and in many tutorials it says to use cptable. Like so: opt <- > which.min(model_rpart$cptable[, "xerror"]) > The problem is that when I look up model_rpart$cptable it only show the > columns CP, nsplit, rel error. So xerror and xstd are missing. How can this > be? > Model looks like this: model <- rpart(Product~. , data=trainData, > control=rpart.control(minsplit=50, cp=0.002, xval=0)) > > Thank you. > Kim > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.