The goal of traitstrap is to select traits in hierarchical sampling designs. For more details on the methods see Maitner et al. (2021).
You can install traitstrap from GitHub with:
# install.packages("remotes")
# remotes::install_github("Plant-Functional-Trait-Course/traitstrap")
install.packages("traitstrap", repos = c('https://plant-functional-trait-course.r-universe.dev', 'https://cloud.r-project.org'))