Dear all, Could any one tell me how the output "relative error" (in CP table) is defined in rpart() in the classification case? Thank you. Regards, Ji ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ji Zhu 439 West Hall Assistant Professor 550 East University Department of Statistics Ann Arbor, MI 48109 University of Michigan (734) 936-2577 (O) jizhu at umich.edu (734) 763-4676 (F) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~