Estimating and Interpreting Models with Endogenous Treatment Effects
考察了工具变量法和控制函数法在估计内生处理效应时的关系，发现两者估计量相近但内生性检验的联系尚不明确，并探讨了两种方法对经济排序行为的含义。
The relationship between two alternative approaches, instrumental variables and control function procedures, for estimating the impact of endogenous treatment effects are examined. Although it is well known that the two approaches generate comparable estimates, the relationship between the estimators and their accompanying endogeneity tests appears not to be well understood. It is shown that the two procedures are closely related. The implications of the two procedures for the underlying economic sorting behavior are also examined.