期刊
REVIEW OF ECONOMICS AND STATISTICS
卷 88, 期 3, 页码 389-432出版社
MIT PRESS
DOI: 10.1162/rest.88.3.389
关键词
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资金
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0852261] Funding Source: National Science Foundation
This paper examines the properties of instrumental variables (IV) applied to models with essential heterogeneity, that is, models where responses to interventions are heterogeneous and agents adopt treatments (participate in programs) with at least partial knowledge of their idiosyncratic response. We analyze two-outcome and multi ple-outcome models, including ordered and unordered choice models. We allow for transition-specific and general instruments. We generalize previous analyses by developing weights for treatment effects for general instruments. We develop a simple test for the presence of essential heterogeneity. We note the asymmetry of the model of essential heterogeneity: outcomes of choices are heterogeneous in a general way; choices are not. When both choices and outcomes are permitted to be symmetrically heterogeneous, the method of IV breaks down for estimating treatment parameters.
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