Causal inference in case-control studies

Sung Jae Jun and Sokbae (Simon) Lee

No CWP19/20, CeMMAP working papers from Centre for Microdata Methods and Practice, Institute for Fiscal Studies

Abstract: We investigate identi?cation of causal parameters in case-control and related studies. The odds ratio in the sample is our main estimand of interest and we articulate its relationship with causal parameters under various scenarios. It turns out that the odds ratio is generally a sharp upper bound for counterfactual relative risk under some monotonicity assumptions, without resorting to strong ig-norability, nor to the rare-disease assumption. Further, we propose semparametrically ef?cient, easy-to-implement, machine-learning-friendly estimators of the aggregated (log) odds ratio by exploiting an explicit form of the ef?cient in?uence function. Using our new estimators, we develop methods for causal inference and illustrate the usefulness of our methods by a real-data example.

Date: 2020-05-04
New Economics Papers: this item is included in nep-big
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