Fit Difference-in-Differences Models with Staggered Interventions R package staggR version 0.2.0 Fits linear difference-in-differences models in scenarios where intervention roll-outs are staggered over time. The package implements a version of an approach proposed by Sun and Abraham (2021) <doi:10.1016/j.jeconom.2020.09.006> to estimate cohort- and time-since-treatment specific difference-in-differences parameters, and it provides convenience functions both for specifying the model and for flexibly aggregating coefficients to answer a variety of research questions. Software Depends: R (>= 4.1) Imports: ggplot2 (>= 3.0.0) Suggests: knitr, rmarkdown, sandwich Kyle Hart <hartky@ohsu.edu> Comprehensive R Archive Network (CRAN) Kyle Hart [aut, cre, cph] (ORCID: <https://orcid.org/0000-0001-8964-204X>), Stephan Lindner [aut] GPL-3 2026-04-02 application/tgz https://CRAN.R-project.org/package=staggR doi:10.32614/CRAN.package.staggR