Hi! I am doing stratified cox proportional hazard regression analyses. I used by statement with proc sort stated ahead. My colleague told me to use strata statement. And I tried but I did not get stratum-specific results. Instead, I only got one HR (assuming there were 3 strata). I wondered how to do this with strata statement. Or, I should stick with the by statement with proc sort. Thank you in advance! Here's the code: proc phreg data=mydata namelen=32;
class A(ref="1") B(ref="0") C(ref="aa");
model personyrs*Y(0)=X
A B C/rl;
strata D;
hazardratio X;
run;
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