On the plausibility of the latent ignorability assumption

Martin Huber

Papers from arXiv.org

Abstract: The estimation of the causal effect of an endogenous treatment based on an instrumental variable (IV) is often complicated by attrition, sample selection, or non-response in the outcome of interest. To tackle the latter problem, the latent ignorability (LI) assumption imposes that attrition/sample selection is independent of the outcome conditional on the treatment compliance type (i.e. how the treatment behaves as a function of the instrument), the instrument, and possibly further observed covariates. As a word of caution, this note formally discusses the strong behavioral implications of LI in rather standard IV models. We also provide an empirical illustration based on the Job Corps experimental study, in which the sensitivity of the estimated program effect to LI and alternative assumptions about outcome attrition is investigated.

Date: 2020-06, Revised 2020-06
New Economics Papers: this item is included in nep-ecm
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Journal Article: On the Plausibility of the Latent Ignorability Assumption (2021)
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