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Psychological Methods2
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Coffman, Donna L.1
Imai, Kosuke1
Keele, Luke1
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Zhong, Wei1
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Assessing Mediation Using Marginal Structural Models in the Presence of Confounding and Moderation
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Coffman, Donna L.; Zhong, Wei – Psychological Methods, 2012
This article presents marginal structural models with inverse propensity weighting (IPW) for assessing mediation. Generally, individuals are not randomly assigned to levels of the mediator. Therefore, confounders of the mediator and outcome may exist that limit causal inferences, a goal of mediation analysis. Either regression adjustment or IPW…
Descriptors: Mediation Theory, Statistical Analysis, Causal Models, Computation
A General Approach to Causal Mediation Analysis
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Imai, Kosuke; Keele, Luke; Tingley, Dustin – Psychological Methods, 2010
Traditionally in the social sciences, causal mediation analysis has been formulated, understood, and implemented within the framework of linear structural equation models. We argue and demonstrate that this is problematic for 3 reasons: the lack of a general definition of causal mediation effects independent of a particular statistical model, the…
Descriptors: Structural Equation Models, Statistical Analysis, Statistical Inference, Intervention