what is rpart in excel what is the function of rpart cross validate what does rpart cross validation mean what is cross validation error? what is a cross validation error what is rpart cross validation error how does rpart crossvalidation work what does cross validation errr mean in rpart how does xerror in rpart work rpart cross validation definition what would be the xerror in cross validation how to check prediction error with rpart how many sets of trees can be cross validated what is xerror in crossvalidation how to calculate cross-validation errors what does rpart mean how rpart computes prediction error does rpart cross validation xerror mean that all tree data is used in a dna tree what is rpart cross validation error what is the function to find the prediction error at each split?