All Questions
3 questions
6
votes
2
answers
2k
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Does the proportional hazards assumption still matter if the covariate is time-dependent?
If I estimate a Cox Proportional Hazards model and my covariate of interest is dependent (continuous or categorical), does the proportional hazards assumption still matter? I recently went to a ...
- 61
4
votes
1
answer
2k
views
Proportional hazards assumption: trouble interpreting my results for cox.zph() function in R
I am testing my proportional hazards assumption in R using the cox.zph() function:
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- 73
0
votes
1
answer
317
views
Cox survival PH violated variable is part of an interaction
One of my main predictors violates the PH assumption. I've been reading different ways to deal with this for a while and have decided on an interaction with time after making a person-period file (...
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