Bridging Methodologies: Angrist and Imbens' Contributions to Causal Identification
连接两种方法论:Angrist 与 Imbens 对因果识别的贡献
In the 1990s, Joshua Angrist and Guido Imbens studied the causal interpretation of Instrumental Variable estimates (a widespread methodology in economics) through the lens of potential outcomes (a classical framework to formalize causality in statistics). Bridging a gap between those two strands of literature, they stress the importance of treatment effect heterogeneity and show that, under defendable assumptions in various applications, this method recovers an average…