> Hey, > > I am just starting to learn R now and I typed in this simple survival > program: > > library(survival) > t <- c(10,13,18,19,23,30,36,38,54,56,59,75,93,97,104,107,107,107) > c <- c(1,0,0,1,0,1,1,0,0,0,1,1,1,1,0,1,0,0) > data <- Surv(t,c) > km <- survfit(data) > summary(km) > Call: survfit(formula = data)
It is best to use a formula with the survfit program; the preferred way to call it would be > km <- survfit(Surv(t, c) ~1) > print(km) > plot(km) etc. Terry Therneau ______________________________________________ R-help@r-project.org mailing list 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.