Dear all,
I have a beginner's R question for coxph() and survfit().
I have a data set with survival time (no censoring) and treatment
indicator(0/1). I did something like
fit<-coxph( Surv(t)~treat, method="breslow",data=data)
> fit
Call:
coxph(formula = Surv(t) ~ treat, data = data, method = "breslow")
coef exp(coef) se(coef) z p
treat -1.96 0.140 0.243 -8.07 6.7e-16
Likelihood ratio test=80.3 on 1 df, p=0 n= 144
> plot(survfit(fit))
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.
Thanks you so much for your help.
Jimmy Chu
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