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