Hirls.aad               Robust estimator for the linear regression
                        model with Huber's weight function and AAD scal
                        by iteratively re-weighted least squares (IRLS)
                        algorithm
Hirls.mad               Robust estimator for the linear regression
                        model with Huber's weight function and MAD scal
                        by iteratively re-weighted least squares (IRLS)
                        algorithm
RrH.aad                 Robust estimator for a generalized ratio model
                        with Huber's weight function and AAD scal by
                        iteratively re-weighted least squares (IRLS)
                        algorithm for M-estimation
RrH.mad                 Robust estimator for a generalized ratio model
                        with Huber's weight function and MAD scal by
                        iteratively re-weighted least squares (IRLS)
                        algorithm for M-estimation
RrT.aad                 Robust estimator for a generalized ratio model
                        with Tukey biweight function and AAD scale by
                        iteratively re-weighted least squares (IRLS)
                        algorithm for M-estimation
RrT.mad                 Robust estimator for a generalized ratio model
                        with Tukey biweight function and MAD scale by
                        iteratively re-weighted least squares (IRLS)
                        algorithm for M-estimation
Tirls.aad               Robust estimator for the linear regression
                        model with Tukey's biweight function and AAD
                        scal by iteratively re-weighted least squares
                        (IRLS) algorithm
Tirls.mad               Robust estimator for the linear regression
                        model with Tukey's biweight function and MAD
                        scale by iteratively re-weighted least squares
                        (IRLS) algorithm
robGR                   Robust estimator for a generalized ratio model
robRatio                Robust estimator for ratio models
robReg                  [Robust estimator for regression models
