Survival, Hazard, Regression, Data Science, Hands On Tutorials.
two samples S_1 and S_2 from the Stanford heart transplant data set which are differentiated by the value of the boolean explanatory variable PRIOR_SURGERY as follows: S_1 = [Set of all patients who have had at least one open-heart surgery prior to entry into the study. PRIOR_SURGERY=1] S_2 = [Set