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- W4386841439 abstract "Unmeasured confounding presents a common challenge in observational studies, potentially making standard causal parameters unidentifiable without additional assumptions. Given the increasing availability of diverse data sources, exploiting data linkage offers a potential solution to mitigate unmeasured confounding within a primary study of interest. However, this approach often introduces selection bias, as data linkage is feasible only for a subset of the study population. To address this concern, we explore three nonparametric identification strategies under the assumption that a unit' s inclusion in the linked cohort is determined solely by the observed confounders, while acknowledging that the ignorability assumption may depend on some partially unobserved covariates. The existence of multiple identification strategies motivates the development of estimators that effectively capture distinct components of the observed data distribution. Appropriately combining these estimators yields triply robust estimators for the average treatment effect. These estimators remain consistent if at least one of the three distinct parts of the observed data law is correct. Moreover, they are locally efficient if all the models are correctly specified. We evaluate the proposed estimators using simulation studies and real data analysis." @default.
- W4386841439 created "2023-09-19" @default.
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- W4386841439 date "2023-09-15" @default.
- W4386841439 modified "2023-09-27" @default.
- W4386841439 title "Multiply robust estimation of causal effects using linked data" @default.
- W4386841439 doi "https://doi.org/10.48550/arxiv.2309.08199" @default.
- W4386841439 hasPublicationYear "2023" @default.
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