Marginal structural models and causal inference in epidemiology.Epidemiology (Cambridge, Mass.), Vol. 11, No. 5. (September 2000), pp. 550-560.
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AbstractIn observational studies with exposures or treatments that vary over time, standard approaches for adjustment of confounding are biased when there exist time-dependent confounders that are also affected by previous treatment. This paper introduces marginal structural models, a new class of causal models that allow for improved adjustment of confounding in those situations. The parameters of a marginal structural model can be consistently estimated using a new class of estimators, the inverse-probability-of-treatment weighted estimators.
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