Difference-in-differences with interference
存在干扰时的双重差分AI 解读 ↓
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存在干扰时的双重差分AI 解读 ↓
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In many scenarios, such as the evaluation of place-based policies, potential outcomes depend not only on the unit’s own treatment but also on its neighbors’ treatments. Despite this, “difference-in-differences” (DID) type estimators typically ignore such interference among neighbors. I show in this paper that the canonical DID estimators generally fail to identify interesting causal effects in the presence of neighborhood interference. To incorporate interference structure into DID estimation, I propose doubly robust estimators for the direct average treatment effect on the treated under a modified parallel trends assumption. I allow spatially correlated assignments, and later relax common restrictions in the literature, such as immediate neighborhood interference and correctly specified spillover functions. Moreover, this paper focuses on a finite-population conditional-inference framework. Robust inference is discussed based on the asymptotic distribution of the proposed estimators.