R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'ROOT'

ROOT::generalizability_path_example |  | Generalizability Path Example: Characterizing Underrepresented Populations | HTML | source | R code
ROOT::optimization_path_example |  | Optimization Path Example: Portfolio Selection via Variance Minimization | HTML | source | R code
ROOT::quickstart |  | Quickstart Guide to ROOT | HTML | source | R code