Direct and Indirect Treatment Effects–Causal Chains and Mediation Analysis with Instrumental Variables
直接与间接处理效应:工具变量下的因果链与中介分析AI 解读 ↓
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直接与间接处理效应:工具变量下的因果链与中介分析AI 解读 ↓
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Summary The paper discusses the non-parametric identification of causal direct and indirect effects of a binary treatment based on instrumental variables. We identify the indirect effect, which operates through a mediator (i.e. intermediate variable) that is situated on the causal path between the treatment and the outcome, as well as the unmediated direct effect of the treatment by using distinct instruments for the endogenous treatment and the endogenous mediator. We examine various settings to obtain non-parametric identification of (natural) direct and indirect as well as controlled direct effects for continuous and discrete mediators and continuous and discrete instruments. We also provide a simulation study and two empirical illustrations.