C2beta                  Compute the coefficients from the continuum
                        regression (CR) algorithm
DIAG                    Generate diagonal matrix
SOLVE                   Helper function to compute the inverse of input
                        X matrix
continuum               The continuum regression (CR) algorithm
continuum.multigroup.iter
                        The Joint and Individual Component Regression
                        (JICO) algorithm
createFolds             Utility function to create folds for stratified
                        samples
cv.continnum.iter       Fit JICO with cross-validation to tune
                        hyperparameters
initialize.UDVZ         Helper function to compute the SVD results
parameter.set.G_2       Generate parameter sets (G=2)
parameter.set.G_3       Generate parameter sets (G=3)
parameter.set.rankA_eq
                        Generate parameter sets (equal individual
                        ranks)
