Author

Pedro H. C. Sant'Anna

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Preprint Sep 2026

Omitted Variable Bias in Difference-in-Differences Designs

We study the omitted variable bias (OVB) problem in canonical difference-in-differences (DiD) designs when unobserved confounding induces departures from the parallel trends assumption. Our results provide a novel characterization of the OVB formula for the average treatment effect on the treated (ATT), which is of ind...

Jue-Jue Wang, Pedro H. C. Sant'Anna, V. Chernozhukov et al. · 0 citations