[R] Cox model with multiple events - Proportional Hazards Assumption

Maria Helena Mourino Silva Nunes nunesmaria at campus.ul.pt
Mon Dec 22 19:26:35 CET 2014

Dear all,

I'm using the package "survival" for adjusting the Cox model with multiple
events (Prentice, Williams and Peterson Model). I have several covariates,
some of them are time-dependent.

I'm using the function"cox.zph" to check the proportional hazards. Due to
the nature of the time-dependent covariates, I don't need to analyse the
assumptions of the proportional hazards associated with the
time-dependent covariates. Is it right?

​Thanks for your attention.

Best regards,

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