PSGD                    Projected Subset Gradient Descent
coef.PSGD               Coefficients for PSGD Object
coef.cv.PSGD            Coefficients for cv.PSGD Object
cv.PSGD                 Cross-Validation - Projected Subset Gradient
                        Descent
predict.PSGD            Predictions for PSGD Object
predict.cv.PSGD         Predictions for cv.PSGD Object
