which is a consequence of cox model? time varying effect which variable would have a time varying effect in a cox model what is the proportionality of cox why does the cox model violate proportionality when do you violate proportionality in cox model which condition is violator of proportionality why violate proportionality in cox model does the cox model violate proportionality? is cox analysis a time-varying model which model violates proportionality? can you repeat the cox model when proportionality is violated how to violate proportionality cox model why does cox model violate proportionality why is the proportionality assumption violated in survival analysis cox proportionality model cox proportionality regression which assumption does the cox model violate? when should a cox model be violated how does the cox model violate proportionality? which cox model is violated