[R] Cox model qustion in R

Thomas Lumley tlumley at u.washington.edu
Thu Mar 31 19:09:54 CEST 2005

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
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?


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