Treatment Effect Estimation in Complex Designs R package DistLagHet version 0.1.0 Implements estimation methods for treatment effects in complex designs under parallel-trends assumptions. Based on the methodology of de Chaisemartin and D'Haultfoeuille (2025) <doi:10.48550/arXiv.2508.07808>. Provides three model specifications: base model with K lags, full dynamics model using all available periods, and interactions model with lag interaction terms. Includes C++ optimizations for faster bootstrap estimation. Software Depends: R (>= 3.5.0) Imports: MASS, Rcpp (>= 1.0.0) LinkingTo: Rcpp, RcppEigen Suggests: testthat (>= 3.0.0) Henri Fabre <henri.fabre@ensae.fr> Comprehensive R Archive Network (CRAN) Clement de Chaisemartin [aut], Xavier D'Haultfoeuille [aut], Henri Fabre [cre, ctb] MIT + file LICENSE (https://CRAN.R-project.org/package=DistLagHet/LICENSE) 2026-10-24 application/tgz https://CRAN.R-project.org/package=DistLagHet doi:10.32614/CRAN.package.DistLagHet