Cited by 462Advanced Causal Inference TechniquesSpatial and Panel Data AnalysisEvaluation and Performance Assessment

The DOI matches its Crossref record; 50 of the 50 references it cites were found in a registry or an index.

The Augmented Synthetic Control Method

Open access
Ben-Michael, Eli, Feller, Avi, Rothstein, Jesse·2021·Journal of the American Statistical Association

Abstract

The synthetic control method (SCM) is a popular approach for estimating the impact of a treatment on a single unit in panel data settings. The “synthetic control” is a weighted average of control units that balances the treated unit’s pretreatment outcomes and other covariates as closely as possible. A critical feature of the original proposal is to use SCM only when the fit on pretreatment outcomes is excellent. We propose Augmented SCM as an extension of SCM to settings where such pretreatment fit is infeasible. Analogous to bias correction for inexact matching, augmented SCM uses an outcome model to estimate the bias due to imperfect pretreatment fit and then de-biases the original SCM estimate. Our main proposal, which uses ridge regression as the outcome model, directly controls pretreatment fit while minimizing extrapolation from the convex hull. This estimator can also be expressed as a solution to a modified synthetic controls problem that allows negative weights on some donor units. We bound the estimation error of this approach under different data-generating processes, including a linear factor model, and show how regularization helps to avoid over-fitting to noise. We demonstrate gains from Augmented SCM with extensive simulation studies and apply this framework to estimate the impact of the 2012 Kansas tax cuts on economic growth. We implement the proposed method in the new augsynth R package.

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Research works printed but not linked: 3

  1. Ben-Michael, E., Feller, A., & Rothstein, J. (2019), “Synthetic Controls With Staggered Adoption,” Journal of the Royal Statistical Society, Series B, Forthcoming, arXiv: 1912.03290. · arXiv
  2. 10.1080/01621459.2021.1920957 · DOI · Paper page
  3. Vovk, V., Gammerman, A., & Shafer, G. (2005), Algorithmic Learning in a Random World, Boston, MA: Springer.

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Metadata

Authors
Ben-Michael, E., Feller, A., & Rothstein, J.
Affiliations
  • Department of Statistics, Institute for Quantitative Social Sciences, Harvard University
  • University of California System (US)
Corresponding author
Feller, Avi
Venue
Journal of the American Statistical Association
Published
2021-07-29
Volume
116
Issue
536
Pages
1789-1803
ISSN
  • 0162-1459 (ISSN-L)
  • 1537-274X
OpenAlex
W3123564515
Cited by
462
References
42
Citations by year
2026: 93 · 2025: 110 · 2024: 79 · 2023: 69 · 2022: 58 · 2021: 33
FWCI
44.66
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Statistical Association (publishedVersion)
  • National Bureau of Economic Research (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • National Bureau of Economic Research (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • arXiv (Cornell University)
  • Figshare (cc-by)
Funders
Institute of Education Sciences (R305D200010)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Advanced Causal Inference Techniques
  • Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Spatial and Panel Data Analysis
  • Social Sciences › Public Administration › Evaluation and Performance Assessment
Keywords
synthetic control method, treatment effect estimation, bias correction, ridge regression, factor models, regularization, overfitting, economic growth

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