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Exogeneity in structural equation models
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DOI：10.1016/j.jeconom.2005.02.010.png)
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The practical relevance of several concepts of exogeneity of treatments for the estimation of causal parameters based on observational data are discussed. We show that the traditional concepts, such as strong ignorability and weak and super-exogeneity, are too restrictive if interest lies in average effects (i.e. not on distributional effects of the treatment). We suggest a new definition of exogeneity, KL-exogeneity. It does not rely on distributional assumptions and is not based on counterfactual random variables. As a consequence it can be empirically tested using a proposed test that is simple to implement and is distribution-free. (c) 2005 Elsevier B.V. All rights reserved.
Keyword:
Kullback-Leibler information
linear exponential family
potential outcomes
ignorability
weak and super exogeneity
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