fit_rcpp                Predict y from X and b
mad_rcpp                Median Absolute Deviation (MAD)
median_rcpp             Median
psiBS_rcpp              Tukey's Bisquare Psi Function
psiHuber_rcpp           Huber Psi Function
robustRegBS             Robust Fitting of Linear Models using Bisquare
                        Psi Function
robustRegH              Robust Fitting of Linear Models using Huber Psi
                        Function
