RXlarlso                Maximum Likelihood Shrinkage in Least Angle
                        Regression via Efron/Hastie lars()
RXridge                 Maximum Likelihood Shrinkage in Regression
RXtrisk                 True MSE Risk of Shrinkage Resulting from
                        Known Regression Parameters
RXtsimu                 True Squared Error LOSS of Shrinkage for a
                        Simulated Response Y-vector Generated using
                        Specified Numerical Values for Regression
                        Parameters
RXuclars                Maximum Likelihood Shrinkage of Least Angle 
                        Regression on X-matrix Uncorrelated Components 