Traditional propensity score estimation faces a fundamental challenge known as the propensity score tautology: researchers iterate between fitting models and checking covariate balance, yet the ...
Instrumental variables (IV) estimation addresses endogeneity arising when an explanatory variable correlates with the error term, biasing ordinary least squares (OLS ...
A brief description of the methods used by the SYSLIN procedure follows. For more information on these methods, see the references at the end of this chapter. There are two fundamental methods of ...
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