multi.s is a package motivated for personal use. It is a wrapped around Daniel Parson’s package, which can be found in this github repository: https://github.com/sdparsons/splithalf. It allows to calculate split-half reliability using random splits.
You can install the development version of multi.s running this code:
if(!require(remotes)){install.packages("remotes")}
remotes::install_github("franfrutos/multi.s")