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What is Learnable in Valiant's Theory of the Learnable? 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On propensity score matching with a diverging number of matches
Yihui He, Fang Han · 2023-10-22 · via math.ST updates on arXiv.org

This paper reexamines Abadie and Imbens (2016)'s work on propensity score matching for average treatment effect estimation. We explore the asymptotic behavior of these estimators when the number of nearest neighbors, $M$, grows with the sample size. It is shown, hardly surprising but technically nontrivial, that the modified estimators can improve upon the original fixed-$M$ estimators in terms of efficiency. Additionally, we demonstrate the potential to attain the semiparametric efficiency lower bound when the propensity score achieves "sufficient" dimension reduction, echoing Hahn (1998)'s insight about the role of dimension reduction in propensity score-based causal inference.

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