Hello running R1.8.0 on Windows I am running a tree model using rpart, and I get a warning NAs introduced by coercion even though when I examine the variables in the tree, none of them have any missing vaues....... What am I missing? TIA, as always Peter L. Flom, PhD Assistant Director, Statistics and Data Analysis Core Center for Drug Use and HIV Research National Development and Research Institutes 71 W. 23rd St www.peterflom.com New York, NY 10010 (212) 845-4485 (voice) (917) 438-0894 (fax)