BMC Medical Research Methodology | |
Quasi-rerandomization for observational studies | |
Research Article | |
Wen Su1  Guosheng Yin1  Hengtao Zhang1  | |
[1] Department of Statistics and Actuarial Science, The University of Hong Kong, Hong Kong, China; | |
关键词: Causal inference; Covariate balance; Observational data; Rerandomization; Treatment effect; | |
DOI : 10.1186/s12874-023-01977-7 | |
received in 2022-10-28, accepted in 2023-06-13, 发布年份 2023 | |
来源: Springer | |
【 摘 要 】
BackgroundIn the causal analysis of observational studies, covariates should be carefully balanced to approximate a randomized experiment. Numerous covariate balancing methods have been proposed for this purpose. However, it is often unclear what type of randomized experiments the balancing approaches aim to approximate; and this may cause ambiguity and hamper the synthesis of balancing characteristics within randomized experiments.MethodsRandomized experiments based on rerandomization, known for significant improvement on covariate balance, have recently gained attention in the literature, but no attempt has been made to integrate this scheme into observational studies for improving covariate balance. Motivated by the above concerns, we propose quasi-rerandomization, a novel reweighting method, where observational covariates are rerandomized to be the anchor for reweighting such that the balanced covariates obtained from rerandomization can be reconstructed by the weighted data.ResultsThrough extensive numerical studies, not only does our approach demonstrate similar covariate balance and comparable estimation precision of treatment effect to rerandomization in many situations, but it also exhibits advantages over other balancing techniques in inferring the treatment effect.ConclusionOur quasi-rerandomization method can approximate the rerandomized experiments well in terms of improving the covariate balance and the precision of treatment effect estimation. Furthermore, our approach shows competitive performance compared with other weighting and matching methods. The codes for the numerical studies are available at https://github.com/BobZhangHT/QReR.
【 授权许可】
CC BY
© The Author(s) 2023
【 预 览 】
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