Comparing Public and Private Schools: The Puzzling Role of Selectivity Bias
比较公立与私立学校：选择性偏误的令人困惑作用
Recent articles using the same data and variants of the same estimation technique report conflicting estimates of the relative quality of education provided by public and Catholic schools. This article explains the reasons for the conflict. In so doing, the article clarifies the assumptions underlying the increasingly popular two-step methods for controlling selectivity bias and highlights the hazards of using these methods when the assumptions are not satisfied. The article…