A simple unified approach for estimating natural direct and indirect effects.

By T. Lange, Stijn Vansteelandt, Maarten Bekaert. American Journal of Epidemiology, 2012

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Advances in mediation analysis: a survey and synthesis of new developments. (2015, methodology): “A third approach to try to satisfy the sequential ignorability assumption is by using marginal structural models (Coffman & Zhong 2012, Lange et al. 2012, VanderWeele 2009).”
Estimation of a Semiparametric Natural Direct Effect Model Incorporating Baseline Covariates (2014, neutral): “, 2012; Zheng & van der Laan, 2012; Lange et al., 2012). While we have considered methods that target a direct effect contrast conditional on V ⊆ X, these other estimators target either marginal direct effects, similar to Tchetgen Tchetgen & Shpitser (2012), or posit a parametric model for the media”