Greetings. I'd like to thank everyone who sent me suggestions of what might have been wrong, especially Matt Austin. He did not actually give me the solution, but rather he inadvertently set me on the path to find it by effectively getting me to look closer at the code I was using. And thus I found myself examining my R and SAS code line by line to see how they differed, and I found that I was not defining "proportion moved" in quite the same way in the SAS and R versions. Once I made R define "proportion moved" the same way as I did in SAS, both versions returned identical results. Thanks again, everybody. Aaron ------------- Aaron Solomon (ben Saul Joseph) Adelman E-mail: adelmaas at musc.edu Web site: http://people.musc.edu/~adelmaas/ AOL Instant Messenger & Yahoo! Messenger: Hiergargo AIM chat-room (preferred): Adelmania