Does the “proc model” in SAS estimate the equations as a system of equations or not? For example, if I have 2 or even 3 equations in the “proc model” and want to estimate them as a system, and want to use the System of 2SLS (ie, S2SLS) and not simply 2SLS. Is it as simple as listing my endogenous, exogenous and instrumental variables; then select the “fit [endogenous var] / 2sls”?

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