[R] Cox model qustion in R

Chao Zhu cznm4 at mizzou.edu
Thu Mar 31 21:41:06 CEST 2005

----- Original Message ----- 
From: "Thomas Lumley" <tlumley at u.washington.edu>
To: "Chao Zhu" <cznm4 at mizzou.edu>
Cc: <r-help at stat.math.ethz.ch>
Sent: Thursday, March 31, 2005 11:09 AM
Subject: Re: [R] Cox model qustion in R

> 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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