[R] kaplan-meier error

Joseph Magagnoli jcm331 at gmail.com
Wed Jul 22 02:23:11 CEST 2009


Hi all, 
I am getting an error in my code and I don't know what the problem is.
I am using R 2.9 on ubuntu.   my code is as follows:

## Libraries ##
library(survival)
library(foreign)

## reading data ##

data<-read.dta("http://psfaculty.ucdavis.edu/bsjjones/cabinet.dta")
head(data)
attach(data)


fit1<-survfit(Surv(durat,censor))
and I get the following error 
> fit1<-survfit(Surv(durat,censor))
Error in survfit(Surv(durat, censor)) :
  Survfit requires a formula or a coxph fit as the first argument
any help is greatly appreciated 
Joe




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