how to model hazard ratio how to model hazard ratio how to model hazard ratio in R how to model proportional hazard ratio in r when to add join time to hazard ratio equation when to combine hazard ratio and registration interval in r which is an example of a hazard ratio how to find the registration interval in r when to insert hazard ratio in r how to model proportional hazards in r what is hazard ratio in r how do you calculate the join time what is the hazard interval in r proportional hazards in r what is the purpose of proportional hazard ratio what is the proportional risk ratio when to enter hazard ratio r how are registration intervals and dates calculated what is the relationship between a date and registration interval in r? when do i need to add a date to r risk