Effect sizes, diagnostics and performance metrics for multilevel and mixed effects models. Includes marginal and conditional R2 estimates for linear mixed effects models based on Johnson 2014.
The vignette shows a complete example.
To get the version from CRAN:
install.packages("multilevelTools")
To get the latest development version, use:
#install.packages("devtools")
devtools::install_github("JWiley/multilevelTools")