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stat.ME2023
Covariate adjustment in randomized experiments with missing outcomes and covariates
Anqi Zhao, Peng Ding, Fan Li
Covariate adjustment can improve precision in analyzing randomized experiments. With fully observed data, regression adjustment and propensity score weighting are asymptotically eq…
stat.ME2023
A randomization-based theory for preliminary testing of covariate balance in controlled trials
Anqi Zhao, Peng Ding
Randomized trials balance all covariates on average and provide the gold standard for estimating treatment effects. Chance imbalances nevertheless exist more or less in realized tr…