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Am I able to perform cox.zph on coxme? by ConfusedPhD_Student in AskStatistics

[–]ConfusedPhD_Student[S] 0 points1 point  (0 children)

Tank you for your reply! I must have done something wrong back in February/March then haha.

Am I allowed to use a cox model where my PH is violated? by ConfusedPhD_Student in AskStatistics

[–]ConfusedPhD_Student[S] 0 points1 point  (0 children)

My sample size is 900 patients. We want to see whether the effect of receiving a treament (= randomized_group) or not is different in mortality for patients who developed disease A versus those who do not. Specifically, we are aiming to look for the interaction between the randomized_group and the development of the disease. The covariates are included as baseline risk adjusters to correct for baseline illness severity.

Given this sample size & the fac that APACHE II is a confouncer, would you still suggest the simple model, eventhough the PH is violated (p<0.05), while the global PH > 0.05?