what is the purpose of a proportional hazard analysis why do hazard ratios have a weighted average what is hazard ratio cox what is the relationship between cox proportional hazards model and logit model? what is the difference between a cox model and a logit model? what is the proportional hazards hypothesis what is the difference between cox proportional hazards and logits what is the significance and difference between proportional hazards and cox models is the standard error of a cox proportional hazard order semi-parametric what is the cox hazard model can cox models be used to calculate standard errors which assumptions are often used when building the proportional hazards model? what is proportional hazards what is the hazard ratio in cox what is cox proportional hazards how are the standard errors calculated in the proportional hazard model? does a cox proportional risk model have standard deviation or standard error does a cox proportional hazards model have a weighted average how do you interpret proportional hazards which assumptions are similar to cox proportional hazards?