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  5. Difference-in-Differences Designs: A Practitioner鈥檚 Guide

Journal of Economic Literature

ISSN 0022-0515 (Print) | ISSN 2328-8175 (Online)

Difference-in-Differences Designs: A Practitioner鈥檚 Guide

  • Andrew Baker
  • Brantly Callaway
  • Scott Cunningham
  • Andrew Goodman-Bacon
  • Pedro H. C. Sant'Anna
Journal of Economic Literature (Forthcoming)

Abstract

Difference-in-differences (DiD) is arguably the most popular quasi-experimental research design. Its canonical form, with two groups and two periods, is well-understood. However, empirical practices can be ad hoc when researchers go beyond that simple case. This article provides an organizing framework for discussing different types of DiD designs and their associated DiD estimators. It discusses covariates, weights, handling multiple periods, and staggered treatments. The organizational framework, however, applies to other extensions of DiD methods as well.

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