Viewpoint: An extended class of instrumental variables for the estimation of causal effects

Karim Chalak (chalak@virginia.edu) and Halbert White

Canadian Journal of Economics, 2011, vol. 44, issue 1, 1-51

Abstract: We examine how structural systems can yield observed variables instrumental in identifying and estimating causal effects. We provide an exhaustive characterization of potentially identifying conditional exogeneity relationships and demonstrate how structural relations determine exogeneity and exclusion restrictions that yield moment conditions supporting identification. This provides a comprehensive framework for constructing instruments and covariates. We introduce notions of conditioning and conditional extended instrumental variables (XIVs). These permit identification but need not be traditional instruments, as they may be endogenous. We distinguish between observed XIVs and proxies for unobserved XIVs. A main message is the importance of sufficiently specifying causal relations governing the unobservables.

JEL-codes: C10 C13 C21 C31 C51 (search for similar items in EconPapers)
Date: 2011
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Citations: View citations in EconPapers (24)

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