MARSGWR_exponential     MARSGWR: a hybrid model that uses the MARS
                        model for important variable selection and the
                        GWR model for prediction at an unknown location
                        based on the selected variables.
MARSGWR_gaussian        MARSGWR: a hybrid model that uses the MARS
                        model for important variable selection and the
                        GWR model for prediction at an unknown location
                        based on the selected variables.
