问题
I am running a mixed effects model using the coxme() function in R. The model analyzes the event of product success of firms in different countries. Fixed effects are for example GDP, population, technology and cultural variables. Random effects are the different countries.
I know that with coxph() it is possible to test for proportional hazard using the cox.zph() command.
My question: How can I check for proportional hazard with coxme()?
来源：https://stackoverflow.com/questions/32401706/r-proportional-hazard-assumption-in-coxme