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Variance estimation for the average treatment effects on the treated and on the controls. Roland A Matsouaka, Yi Liu, Yunji Zhou. Statistical Methods in Medical Research. journals.sagepub.com/doi/abs/10.117…

Average treatment effect on the treated, under lack of positivity. Yi Liu, Huiyue Li, Yunji Zhou, Roland A Matsouaka. Statistical Methods in Medical Research. journals.sagepub.com/doi/abs/10.117…

When does adjusting covariate under randomization help? A comparative study on current practices. Ying Gao, Yi Liu & Roland Matsouaka. BMC Medical Research Methodology. bmcmedresmethodol.biomedcentral.com/articles/10.11…