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stat.ME2025
A tutorial for propensity score weighting methods under violations of the positivity assumption
Yi Liu, Yuan Wang, Ying Gao +2
Violations of the positivity assumption can render conventional causal estimands unidentifiable, including the average treatment effect (ATE), the average treatment effect on the t…
stat.ME2025
Variance Estimation for Weighted Average Treatment Effects
Huiyue Li, Yi Liu, Yunji Zhou +3
Common variance estimation methods for weighted average treatment effects (WATEs) in observational studies include nonparametric bootstrap and model-based, closed-form sandwich var…
stat.ME2024
Average treatment effect on the treated, under lack of positivity
Yi Liu, Huiyue Li, Yunji Zhou +1
The use of propensity score (PS) methods has become ubiquitous in causal inference. At the heart of these methods is the positivity assumption. Violation of the positivity assumpti…