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- W3087707851 abstract "Unmeasured confounding is a key challenge for causal inference. Negative control variables are widely available in observational studies. A negative control outcome is associated with the confounder but not causally affected by the exposure in view, and a negative control exposure is correlated with the primary exposure or the confounder but does not causally affect the outcome of interest. In this paper, we establish a framework to use them for unmeasured confounding adjustment. We introduce a confounding bridge function that links the potential outcome mean and the negative control outcome distribution, and we incorporate a negative control exposure to identify the bridge function and the average causal effect. Our approach can be used to repair an invalid instrumental variable in case it is correlated with the unmeasured confounder. We also extend our approach by allowing for a causal association between the primary exposure and the control outcome. We illustrate our approach with simulations and apply it to a study about the short-term effect of air pollution. Although a standard analysis shows a significant acute effect of PM2.5 on mortality, our analysis indicates that this effect may be confounded, and after double negative control adjustment, the effect is attenuated toward zero." @default.
- W3087707851 created "2020-09-25" @default.
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- W3087707851 date "2018-08-14" @default.
- W3087707851 modified "2023-10-16" @default.
- W3087707851 title "A Confounding Bridge Approach for Double Negative Control Inference on Causal Effects" @default.
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- W3087707851 doi "https://doi.org/10.48550/arxiv.1808.04945" @default.
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