The E option in the ESTIMATE statement prints the L matrix, so that you can confirm your specification is estimating what you want it to. The JOINT option is what actually performs the joint test. The 1’s are the coefficients for the estimate you want. If you are unfamiliar with the concepts and syntax for writing contrasts and estimates, you will need to do a bit of homework. There is good SAS Note and many posts here in the Communities.
Yes, the joint test result is the F test at the end. It’s easier to navigate the output if you add labels in your ESTIMATE statements. Such as:
estimate “Joint test of A and B” a 1, b 1 / joint e;
You don’t have an interaction effect in your model, so the model results are the same. They are not affected by ESTIMATE statements. Your estimate is non-estimable, though. Since you have a 2-level class var, I believe this is what you want, but I have not confirmed it:
estimate homa_ir 1, demo_age 1 -1 /joint e;
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