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Yongnam Kim

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Open access Sep 2026

Difference-in-Differences and Treatment x Pretest Interactions: A Critique of Dual-Centered ANCOVA

This paper critically examines dual-centered ANCOVA, proposed by Lin and Larzelere (2020) and Larzelere and Lin (2025), which is claimed to accommodate a Treatment X Pretest interaction while preserving the difference-in-differences (DiD) estimate. We take issue with their claims on four grounds. First, DiD without an...

Byunghoon Jeon, Yongnam Kim · 0 citations

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