bayesplot, boot, cluster, corrplot, ggplot2, graphics,
gridExtra, loo, methods, mlbench, Rcpp (>= 0.12.0),
RcppParallel (>= 5.0.1), rstan (>= 2.18.1), rstantools (>=
2.1.0.9000), SemiPar, stats, geometry, MASS