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    Hazardratio statement, interaction in Proc Phreg (cox-regression)

    Hello SAS friends, I have a question that I cannot solve. I am about to use cox-regression to estimate the interaction between two binary variables: Disease (1,0) and Drug (1,0). Disease: 1=Disease, 0=No disease Drug: 1=Drug, 0=No drug This make the interaction a “2x2 table” (as below). Here...