[R] Contrasts in coxph

[Göran Broström]

Dear John,

I googled "contrasts Cox regression" and found

https://stats.stackexchange.com/questions/15603/performing-contrasts-among-treatment-levels-in-survival-analysis

where Frank Harrell reports how to do what you want with his rms 
package. At least I think so, haven't tried it myself.

Best, Göran

On 2021-04-06 05:28, Sorkin, John wrote:
> I would like to define contrasts on the output of a coxph function.
> It appears that the contrast function from the contrast library does
> not have a method defined that will allow computation of contrasts on
> a coxph object.
> 
> How does one define and evaluate contrasts for a cox model?
> 
> Thank you, John
> 
> John David Sorkin M.D., Ph.D. Professor of Medicine Chief,
> Biostatistics and Informatics University of Maryland School of
> Medicine Division of Gerontology and Geriatric Medicine Baltimore VA
> Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD
> 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone
> number above prior to faxing)
> 
> 
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