[R] How to generate a prediction equation for a stratified survival model that was fitted by cph() in Design package

Frank E Harrell Jr f.harrell at vanderbilt.edu
Fri Dec 12 00:57:55 CET 2008

Yu, Changhong wrote:
> Dear all,
> I used cph() function from Frank harrell's Design package to create a
> survival model, then used functions 'Function' and 'sascode' to generate
> prediction equation based on the saved survival model. But it failed. I
> included a stratified variable in the model. If I removed the
> stratification, they were working well. Does that mean that function
> 'Function' doesn't accept a stratified model?

It is supposed to work for that case.  Please send trivial example code 
with data defined in the code that replicates the problem you are 
seeing, and I'll debug.


> Any thoughts on this will be appreciated. Thanks.
> Changhong
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Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University

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