[R] Estimating survival?

[Frank E Harrell Jr]

Min-Han Tan wrote:
> Hi,
> 
> Sorry to trouble the list. I have a problem which I'm not sure how to resolve.
> 
> I have a Cox model with 1 independent variable with 2 categories (and
> thus 2 survival curves on plotting survfit)
> 
> How can I get an estimate of survival for each category at a
> particular time point, with standard error?
>  
> Looking through ?cph and ?coxph, I'm not quite sure how to go about
> that. I would really appreciate any direction here.
> 
> Thanks a million!
> 
> Min-Han

The survest function in the Design package makes this easy.  You can 
also probably do it without a lot of hassle using standard survival 
package routines. With survest you can easily specify covariate 
combinations for which to obtain predictions.

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University