[R] cox.zph

[Sorkin, John]

Colleagues,

I would like to make certain that my understanding of the tabular output produced by cox.zph is correct.

Am I correct that the NULL hypothesis being tested is that the hazard is proportional in time?  Therefor a non-significant result indicates that we don't have evidence that the proportional hazards assumption is incorrect and we can assume that the hazard is proportional. A significant result indicates that we have evidence that the proportional hazards assumption is violated.

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)