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

Viewpoint: An extended class of instrumental variables for the estimation of causal effects 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Canadian Journal of Economics/Revue Canadienne D'économique Wiley

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

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References (112)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0008-4085
eISSN
1540-5982
DOI
10.1111/j.1540-5982.2010.01622.x
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Canadian Journal of Economics/Revue Canadienne D'économiqueWiley

Published: Feb 1, 2011

Keywords: ; ; ; ;

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