Hello, I'm using R 1.6.2's survival2.9-6 package, and I just thought I'd note that it took me a long time to realize that the coxph.detail()$hazard was a centered hazard (centered at the exponentiated average covariate times beta), not a baseline hazard. The documentation simply says "the hazard increment". I don't know if this has been clarified in the latest version of R, but it would probably prevent confusion to state that it is a centered hazard. Thank you, Hormuzd Katki Hormuzd Katki Biostatistics Branch, Division of Cancer Epidemiology and Genetics National Cancer Institute 6120 Executive Blvd. Room 8044 MSC 7244 Rockville, MD 20852-4910 301-594-7818 (voice) 301-402-0081 (fax) katkih at mail.nih.gov