[R] Kaplan-Meier survfit problem

[Dimitris Rizopoulos]

you need:

survfit(Surv(days, status == 1) ~ 1)


I hope it helps.

Best,
Dimitris


On 4/19/2010 4:44 AM, ericyujin99 wrote:
>
> When I try to the code from library(survival) of library(ISwR),
>
> the following code
>
> survfit(Surv(days,status==1))
>
> that could produce Kaplan-Meier estimates shows the following error
>
> "Error in survfit(Surv(days, status == 1)) :
>    Survfit requires a formula or a coxph fit as the first argument"
>
> How it can be done in R.2.10

-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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