What is the PH-assumption?
A) The probability of Y=0 do not exceed 0.25
B) The hazard ratio increases over time
C) The hazard ratio decreases over time
D) The ratio of the hazard for subjects with different values on covariates is the same across time periods

Question

Quizplus · Accepted Answer

The PH-assumption, or proportional hazards assumption, states that the hazard ratio between different groups remains constant over time.

What Is the PH-Assumption