Hi everyone, I need some help using proc phreg to test a population to 2 control populations for my adjusted COX model. I have a dataset made of 3 populations, which are matched with each other using greedy matching macro. Case=1 refers to population A, which I have matched in a ratio of 1:4 to the background population(case=0, count) and population B(case=2, count_s) in a ratio of 1:1. The problem is that I am currently testing population A separately with the other population; so 2 populations at a time. I wanna to know how to test population A with both the background population and population B at the same time. The code I am currently using; Proc phreg data=dataset;
class case (Ref='0');
Model time_to_event * event_end (2)= variables variables variables variables /rl;
strata count;
run;
Proc phreg data=dataset;
class case (Ref='2');
Model time_to_event * event_end (2)= variables variables variables variables /rl;
strata count_s;
run; Thanks for the help! 🙂
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