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Identification of causal mechanisms based on between-subject double randomization designs
Discussion paper / Internet publication
 
ID 4481895
Author(s) Strobl, Renate; Wunsch, Conny
Author(s) at UniBasel Strobl, Renate
Wunsch, Conny
Year 2018
Month and day 06-30
Title Identification of causal mechanisms based on between-subject double randomization designs
Series title WWZ Working Papers
Volume 2018
Number 19
Pages 58
Publisher / Institution WWZ
Keywords Direct and indirect effects, causal inference, mediation analysis, identification
Abstract Understanding the mechanisms through which treatment effects come about is crucial for designing effective interventions. The identification of such causal mechanisms is challenging and typically requires strong assumptions. This paper discusses identification and estimation of natural direct and indirect effects in so-called double randomization designs that combine two experiments. The first and main experiment randomizes the treatment and measures its effect on the mediator and the outcome of interest. A second auxiliary experiment randomizes the mediator of interest and measures its effect on the outcome. We show that such designs allow for identification based on an assumption that is weaker than the assumption of sequential ignorability that is typically made in the literature. It allows for unobserved confounders that do not cause heterogeneous mediator effects. We demonstrate estimation of direct and indirect effects based on different identification strategies that we compare to our approach using data from a laboratory experiment we conducted in Kenya.
edoc-URL https://edoc.unibas.ch/64979/
Full Text on edoc Available
 
   

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