The gsDesignCRT package supports group sequential cluster randomized trial design, extending the package gsDesign (Anderson, 2025) based on methods described in the manuscript "Designing group sequential cluster randomized trials with continuous or binary outcomes" by Lee Ding and Rui Wang.
# To install the development version from GitHub:
# install.packages("remotes")
remotes::install_github("leejtding/gsDesignCRT")