A staggered difference-in-differences estimator that identifies treatment effects by extrapolating a pre-treatment polynomial gap, instead of requiring a flat gap.
arXiv preprint arXiv:2505.09942 , year=
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Beyond Parallel Trends in Staggered Difference-in-Differences: Identification under Higher-Order Parallelism
A staggered difference-in-differences estimator that identifies treatment effects by extrapolating a pre-treatment polynomial gap, instead of requiring a flat gap.