[R] Selective Survival Statistics with R

[Gregory Pierce]

On Mon, 2006-06-05 at 18:54 -0400, Barker, Chris [SCIUS] wrote:
> Its probably easiest/fastest for you either to subset your dataset
> first, or else simply use the subset option in survfit()
> 
>  e.g. 
> 
> survfit( ) has a subset option,  
> survfit( Surv( , ) ~ physician , subset=='Jones")
> 
Chris,

Thank you very much for your kind reply. Using subset worked. I had to
modify the syntax a little from what you posted:

survfit(Surv(days,status==1)~Physician,subset(viatorr,viatorr[6]=="Pierce")

where viatorr is the name of my data set.

Applying plot to the function above generated a survival curve for my
patients. I was also able to plot survival curves for other physicians
as well. This is great!