Rcpp (>= 0.12.6), randtoolbox, fastGHQuad, RSpectra,
sirt,FactoMineR, MASS, ade4
Rcpp (>= 0.12.6), randtoolbox, fastGHQuad, RSpectra,
FactoMineR, MASS, ade4, sirt, paran, statmod, optimx, mvtnorm,
numDeriv, stats, utils