Just out of curiosity, has anyone else seen this? http://www.fas.umontreal.ca/BIOL/Casgrain/en/labo/R/v4/index.html Cheers, Andy -- Andy Liaw, PhD Biometrics Research PO Box 2000, RY33-300 Merck Research Labs Rahway, NJ 07065 mailto:andy_liaw at merck.com 732-594-0820