Corrigendum: Instrumental Variables with Unrestricted Heterogeneity and Continuous Treatment
REVIEW OF ECONOMIC STUDIES(2017)
摘要
Kasy (2014) considers a triangular system of equations characterized by the following assumptions:Under these assumptions, the following definitions are introduced:It is claimed in the statement and proof of Kasy (2014),, theorem 1, that under these assumptions: P(Y≤y|X=x,Z=z)=P(Yx≤y|X=x,Z=z)=P(Yx≤y|Zx=z,Z=z)=P(Yx≤y|Zx=z).This assertion is wrong, the following theorem 1 states a corrected version. For theorem 1 to hold, we need to additionally impose the following regularity conditions.The second part of assumption 5
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