Late Again with Defiers

Clément de Chaisemartin and Xavier D'Haultfoeuille

Abstract: We show that the Wald statistic still identifies a causal effect if instrument monotonicity is replaced by a weaker condition, which states that the potential propensities to be treated with or without the instrument should have the same distribution, conditional on potential outcomes. This holds for instance if the slippages between these potential propensities and the average propensity are independent of potential outcomes. In this framework, the Wald statistic identifies a LATE on a population which comprises both compliers and always takers.

Keywords: Instrumental Variables; Monotonicity; Defiers; Rank Invariance; Exchangeable random variables (search for similar items in EconPapers)
Date: 2012-05
Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00699646v1
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