Hi, I am using rpart to build a decision tree, I am then using printcp to find the cross-validation error (xerror) of different splits of the decision tree. I was wondering how I can use the rpart package to find sensitivity (false negative) and specificity (false positive) of cross-validation folds? In addition I was wondering how many cross-validation folds does printcp uses? Thanks for your help. Regards, Parsa [[alternative HTML version deleted]]