A Dirichlet Process mixture over cohort-time treatment effects recovers pooling structure in staggered DiD, cutting variance by 26-52% in favorable simulations and flagging when full pooling is adequate.
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Partial Homogeneity in Staggered Difference-in-Differences
A Dirichlet Process mixture over cohort-time treatment effects recovers pooling structure in staggered DiD, cutting variance by 26-52% in favorable simulations and flagging when full pooling is adequate.