LAD                     Least Absolute Deviance Estimator for Linear
                        Regression
LADlasso                LAD-Lasso for Linear Regression
MTE                     Maximum Tangent-likelihood Estimation
MTElasso                MTE-Lasso estimator
huber.lasso             Huber-Lasso estimator
huber.reg               Huber estimation for linear regression
huberloss               Huber Loss
