摘要：We discuss instrumental variables (IV) estimation in the broader context of the generalized method of moments (GMM), and describe an extended IV estimation routine that provides GMM estimates as well as additional diagnostic tests. Stand-alone test procedures for heteroskedasticity, overidentification, and endogeneity in the IV context are also described.
关键词：instrumental variables;generalized method of moments;endogeneity;heteroskedasticity;overidentifying restrictions;clustering;intra-group correlation
