polynom (>= 1.3-9), Formula, methods, stats, utils
gurobi (>= 8.1-0), slam (>= 0.1-42), cplexAPI (>= 1.3.3),
lpSolveAPI (>= 5.5.2.0-17), testthat (>= 2.0.0), data.table (>=
1.12.0), splines2 (>= 0.2.8), Matrix, knitr, rmarkdown, pander,
AER, ggplot2, gridExtra