While the statements below about cox.zph are true, plotting the cox.zph result
does tell you what the HR is doing. I never use one without the other.
--
Kevin E. Thorpe
Head of Biostatistics, Applied Health Research Centre (AHRC)
Li Ka Shing Knowledge Institute of St. Michael's
Assistant
Further to John Sorkin's post on the cox.zph:
You get test(s) of whether there is an interaction between a variable, say,
sex, and time.
Suppose it is significant. You will have no clue whether the M/W hazard ratio
is increasing or decreasing by time.
Suppose it is not significant. You will
Yes. :-)
Best regards -- Gerrit
-
Dr. Gerrit Eichner Mathematical Institute, Room 212
gerrit.eich...@math.uni-giessen.de Justus-Liebig-University Giessen
Tel: +49-(0)641-99-32104 Arndtstr. 2,
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
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