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# CITATION file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "fetwfe" in publications use:'
type: software
license: MIT
title: 'fetwfe: Fused Extended Two-Way Fixed Effects'
version: 1.27.3
doi: 10.48550/arXiv.2312.05985
identifiers:
- type: doi
  value: 10.32614/CRAN.package.fetwfe
abstract: Calculates the fused extended two-way fixed effects (FETWFE) estimator for
  unbiased and efficient estimation of difference-in-differences in panel data with
  staggered treatment adoption. This estimator eliminates bias inherent in conventional
  two-way fixed effects estimators, while also employing a novel bridge regression
  regularization approach to improve efficiency and yield valid standard errors. Also
  implements extended TWFE (etwfe) and bridge-penalized ETWFE (betwfe). Provides S3
  classes for streamlined workflow and supports flexible tuning (ridge and rank-condition
  guarantees), automatic covariate centering/scaling, and detailed overall and cohort-specific
  effect estimates with valid standard errors. Includes simulation and formatting
  utilities, extensive diagnostic tools, vignettes, and examples. See Faletto (2025)
  (<https://doi.org/10.48550/arXiv.2312.05985>).
authors:
- family-names: Faletto
  given-names: Gregory
  email: gfaletto@gmail.com
  orcid: https://orcid.org/0000-0001-8298-1401
preferred-citation:
  type: article
  title: Fused Extended Two-Way Fixed Effects for Difference-in-Differences With Staggered
    Adoptions
  authors:
  - family-names: Faletto
    given-names: Gregory
    email: gfaletto@gmail.com
    orcid: https://orcid.org/0000-0001-8298-1401
  journal: arXiv preprint
  year: '2025'
  url: https://arxiv.org/abs/2312.05985
  doi: 10.48550/arXiv.2312.05985
repository: https://gregfaletto.r-universe.dev
repository-code: https://github.com/gregfaletto/fetwfePackage
commit: 399345b36fcbf5ef0589982499d9d59baf38e3fc
url: https://github.com/gregfaletto/fetwfePackage
date-released: '2026-06-11'
contact:
- family-names: Faletto
  given-names: Gregory
  email: gfaletto@gmail.com
  orcid: https://orcid.org/0000-0001-8298-1401