Difference-in-Differences in Heterogeneous Adoption Designs with Quasi Untreated Groups R package DIDHAD version 2.0.0 Estimation of Difference-in-Differences (DiD) estimators from de Chaisemartin et al. (2025) <doi:10.48550/arXiv.2405.04465> in Heterogeneous Adoption Designs with Quasi Untreated Groups. Software Imports: YatchewTest (>= 1.1.0), nprobust, ggplot2, plm, rnames, stats, haven, rlang, dplyr Diego Ciccia <diego.ciccia@kellogg.northwestern.edu> Comprehensive R Archive Network (CRAN) Diego Ciccia [aut, cre], Felix Knau [aut], Doulo Sow [aut], Clément de Chaisemartin [aut], Xavier D'Haultfoeuille [aut] MIT + file LICENSE (https://CRAN.R-project.org/package=DIDHAD/LICENSE) 2025-08-18 application/tgz https://CRAN.R-project.org/package=DIDHAD doi:10.32614/CRAN.package.DIDHAD