Colleagues, I hope someone can tell me how to plot a cox model that contains an interaction term.
I know that plot(survfit(. . . . )) can be used to plot a Cox model, i.e.. coxfit <- coxph(Surv(futime, fustat) ~ age+rx, data = ovarian) plot(survfit(fit, newdata=data.frame(age=60,rx=2))) but I don't know how to plot a cox model with an interaction, i.e. coxfit <- coxph(Surv(futime, fustat) ~ age+rx+age*rx, data = ovarian) plot(survfit(fit, newdata=data.frame(???????))) Thank you, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing) ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
