is cox hazard independent? are cox proportional hazard assumptions time dependent what is the cox proportional hazard assumption? is cox proportional hazard assumption time dependent is interest rate a time dependent variable r what tests for cox proportional hazard assumption when testing cox proportional hazard assumption in r r what is proportional hazard assumption cox proportional hazard assumption cox proportional hazard assumption testing which of the following is considered time-dependent is interest rate considered time independent what is cox proportional hazard assumption is rate time independent is int_rate a time independent variable why are cox proportional hazard assumptions time independent or time independent? how does r test hazard? which covariate is a time independent variable cox proportional hazard assumption is interest rate a time dependent variable