I have run a proc mixed regression analysis and I need to run some post-estimation commands to test whether the treatment had a non-zero impact for a certain racial group. Specifically, say we have the (simplified) model Y = B0 + B1(Treatment) + B2(Black) + B3(Treatment*Black). I want to test if (B1-B3)=0. Which command would I use in SAS? I have read the few guides on ESTIMATE, CONTRAST, and LSESTIMATE, but I don’t know which one to use nor what the values represent.
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