Violation of the PH assumption
What can you do if the proportional hazard assumption is violated for a predictor?
Answer the question
Stratify the sample according to this predictor and analyse the strata separately.
Use time-independent coefficients to resolve interactions of time and predictor effects.
Use cross-validation and divide the data randomly into parts.
Collect more data to get a more precise estimation of the predictor's coefficient.
Take Hint (-15xp)