EFM                     The EFM function is to generate Elliptical
                        Factor Models data.
FanPC.EFM               Apply the FanPC method to the Elliptical Factor
                        Model
PC1.EFM                 Apply the PC method to the Elliptical Factor
                        Model
PPC                     PPC: Principal Projection Components
PPC1.EFM                Apply the PPC method to the Elliptical Factor
                        Model
SOPC.EFM                SOPC Estimation Function for Elliptical Factor
                        Model
elliptical_errors       Calculate errors for elliptical distributions
incremental_perturb_pca
                        Incremental Perturbation PCA
robust_perturb_pca      Random Perturbation Robust PCA
