RedWine                 Red wine quality dataset of the Portuguese
                        "Vinho Verde" wine
WhiteWine               White wine quality dataset of the Portuguese
                        "Vinho Verde" wine
rsq                     A function to calculate most of the available
                        pseudo R-squared measures
surr_rsq                A function to calculate the surrogate R-squared
                        measure.
surr_rsq_ci             A function to calculate the interval estimate
                        of the surrogate R-squared measure
surr_rsq_rank           The contribution of each variable in the final
                        model
