On Fri, 10 Jun 2005, Remigijus Lapinskas wrote: > Dear All, > > A very simple question: > > > library(survival) > > fit <- coxph(Surv(time, status) ~ x, data=aml) > > survfit(fit) > Call: survfit.coxph(object = fit) > > n events median 0.95LCL 0.95UCL > 23 18 30 18 45 > > I believe I know what is median here, but how to extract it? >
This turns out to be trickier than one would ideally like fit$time[min(which(fit$surv<=0.5))] works if there is a single stratum, as in your example. Or, even uglier, you can capture then entire table with > read.table(textConnection(capture.output(survfit(fit))),skip=2,header=TRUE) n events median X0.95LCL X0.95UCL 1 23 18 30 18 45 which does work for stratified survfits. -thomas ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html