Re: [R] Cox model qustion in R

From: Thomas Lumley <tlumley_at_u.washington.edu>
Date: Fri 01 Apr 2005 - 03:09:54 EST

On Wed, 30 Mar 2005, Chao Zhu wrote:
>
> But it only gives me the curve with combined treatment. How do I get a
> plot with two curves for different treatments. I don't want to do
> new<-data.frame(treat=c(0,1)) and plot(survfit(fit,newdata=new))
> cause it gives you predicted curves for two treatments.
>

I think you are going to have to be clearer about what you want. If you want the Kaplan--Meier estimator for each treatment separately then

   plot(survfit(Surv(t)~treat))
will do it. Otherwise I don't know what you're trying to do.

By the way, do you really have no censoring in the time variable?

         -thomas



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