npsdr                   A unified Principal sufficient dimension
                        reduction method via kernel trick
npsdr_x                 Reconstruct estimated sufficient predictors for
                        new data
plot.npsdr              Plot sufficient predictors from an npsdr object
plot.psdr               Plot sufficient predictors from a psdr object
psdr                    Unified linear principal sufficient dimension
                        reduction methods
psdr_bic                Structural dimension selection for principal
                        SDR
rtpsdr                  Real time sufficient dimension reduction
                        through principal least squares SVM
