On Jul 21, 2009, at 7:23 PM, Joseph Magagnoli wrote:
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
Try:
fit1 <- survfit(Surv(durat, censor) ~ 1, data = data)
See ?survfit and note in the description of 'formula':
For a single survival curve the right hand side should be ~ 1.
I would also avoid using attach() as it can create subsequent
problems, which is why there is the 'data' argument to most R
functions that take a formula argument.
HTH,
Marc Schwartz
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