A CAUSAL INTERPRETATION OF EXTENSIVE AND INTENSIVE MARGIN EFFECTS IN GENERALIZED TOBIT MODELS

• 成果类型: Article
• 署名作者: Staub, Kevin E.
• 署名单位: University of Melbourne
• 刊物名称: REVIEW OF ECONOMICS AND STATISTICS
• ISSN/ISSBN: 0034-6535
• DOI: 10.1162/REST_a_00350
• 发表日期: 2014-05
• 页码: 371-375
• 关键词: principal stratification

摘要

This note proposes a new decomposition of average treatment effects on nonnegative outcomes. It represents the total effect as a population-weighted sum of the effects for two groups: those induced to participate by the treatment and those participating regardless of it. The usual decomposition into extensive and intensive margins used in the literature is generally incompatible with such a causal interpretation. The difference between decompositions can be substantial and yield diametrically opposed results.