[R] Contrasts in coxph

[Sorkin, John]

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)