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Optimality of Matched-Pair Designs in Randomized Controlled Trials

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arxiv 2206.07845 v1 pith:CVCOYCNA submitted 2022-06-15 econ.EM math.STstat.MEstat.TH

classification econ.EMmath.STstat.MEstat.TH
keywords designaveragecontrolleddesignsmatched-pairrandomizationrandomizedrcts
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In randomized controlled trials (RCTs), treatment is often assigned by stratified randomization. I show that among all stratified randomization schemes which treat all units with probability one half, a certain matched-pair design achieves the maximum statistical precision for estimating the average treatment effect (ATE). In an important special case, the optimal design pairs units according to the baseline outcome. In a simulation study based on datasets from 10 RCTs, this design lowers the standard error for the estimator of the ATE by 10% on average, and by up to 34%, relative to the original designs.

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  1. Randomization Tests in Randomized Saturation Designs

    stat.ME 2026-07 accept novelty 5.5 of 10

    Conditional and pairwise-imputation randomization tests deliver finite-sample or asymptotic validity for partially sharp, bounded, average, and monotone spillover nulls in randomized saturation designs.

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