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Viewpoint: An extended class of instrumental variables for the estimation of causal effects
In: The Canadian journal of economics: the journal of the Canadian Economics Association = Revue canadienne d'économique, Band 44, Heft 1, S. 1-51
ISSN: 1540-5982
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.
Reexamining the Evidence on Gun Ownership and Homicide Using Proxy Measures of Ownership
In: Journal of Public Economics, Band 208
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