I have a questions on Simultaneous Equations Model implementing using SAS, x = f(y, z1, z2) y = f(x, z1, z3) I tried to use 2SLS in proc model to estimate, however it seems that SAS implement them separately and get two R^2 for each model, is that a way to estimate simultaneously and get a system-wide R^2? Hope anyone can provide me the answer, I really appreciate that. Thx
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