Re: [R] cox.zph

2021-04-01 Thread Kevin Thorpe
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 Profes

Re: [R] cox.zph

2021-04-01 Thread Bendix Carstensen
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 hav

Re: [R] cox.zph

2021-03-31 Thread Gerrit Eichner
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, 3539

[R] cox.zph

2021-03-31 Thread 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