Econ Papers Daily / 期刊论文
我们何时（不）应将线性IV估计量解释为LATE？
When Should We (Not) Interpret Linear IV Estimands as LATE?*
摘要
In this paper I revisit the interpretation of the linear instrumental variables (IV) estimand as a weighted average of conditional local average treatment effects (LATEs). I focus on a situation in which additional covariates are required for identification while the reduced-form and first-stage regressions may be misspecified due to an implicit homogeneity restriction on the effects of the instrument.
中文摘要
本文重新审视了线性工具变量（IV）估计量作为条件局部平均处理效应（LATEs）加权平均的解释。我关注的情形是，为了识别需要额外的协变量，而简化式和第一阶段回归可能由于对工具变量效应的隐含同质性限制而出现设定错误。