You are dealing with Classification and Regression Trees and NOT Decision Trees. Decision Trees are NOT CART and CART are NOT Decision Trees This language or conceptual error seems to be very widespread in your community. Simply because too many people seem to confuse the two fields does not justify the continued confusion. A simple google search on Decision Trees will clarify the problem for you. *Jon Dickens* *+1 209 280 6442* jon.dickens1607@gmail.com