
Hi everyone,
I am not new to R, but new to running survival models in R.

I am trying to create some basic KM curves, using the following code:


library(survival)
library(KMsurv)

(import data etc - basic right censored, with continuously observed time of death)

sleepfit <- survfit(Surv(timeb, death), data = sleep)

Here timeb is measured is survival in years, death is a 1/0 indicator (1 = event = death), and the dataset is called sleep.


But I get the following error

Error in UseMethod("survfit", formula) :
  no applicable method for 'survfit' applied to an object of class "Surv"

I'm not sure what I'm doing wrong, as I followed the example from
the following paper http://anson.ucdavis.edu/~hiwang/teaching/10fall/R_tutorial%201.pdf , page 4 as a guide.



I also tried

sleepfit <- survfit(Surv(timeb, death==1), data = sleep)

and

sleepfit <- survfit(Surv(starttime, endtime, death), data = sleep)



Can anyone tell me what I might be doing wrong?
Thanks,
Lucy



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