Instrumental Variables and the Search for Identification: From Supply and Demand to Natural Experiments
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The method of instrumental variables was first used in the 1920s to estimate supply and demand elasticities, and later used to correct for measurement error in single-equation models. Recently, instrumental variables have been widely used to reduce bias from omitted variables in estimates of causal
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美国国家经济研究局创建时间：
2001-09-01
