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A Simple Approach to Staggered Difference-in-Differences in the Presence of Spillovers

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  • Fiorini, Mario

    (University of Sydney)

  • Lee, Wooyong

    (University of Sydney)

  • Pfeifer, Gregor

    (University of Sydney)

Abstract

We establish identifying assumptions and estimation procedures for the ATT in a Difference-in-Differences setting with staggered treatment adoption in the presence of spillovers. We show that the ATT can be estimated by a simple TWFE method that extends the approach of Wooldridge [2022]'s fully interacted regression model. We broaden our framework to the non-linear case of count data, offering estimation of the ATT by a simple TWFE Poisson model, and we revisit a corresponding application from the crime literature. Monte Carlo simulations show that our estimator performs competitively.

Suggested Citation

  • Fiorini, Mario & Lee, Wooyong & Pfeifer, Gregor, 2024. "A Simple Approach to Staggered Difference-in-Differences in the Presence of Spillovers," IZA Discussion Papers 16868, Institute of Labor Economics (IZA).
    • Handle: RePEc:iza:izadps:dp16868
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    References listed on IDEAS

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