Hugging                 Hugging
OPC                     The online principal components can handle data
                        sets that are updated in real time and
                        streaming data.
PC                      The traditional principal component method.
                        This method can estimate the eigen space of the
                        data set.
PSA                     Prostate Specific Antigen
SOPC                    The sparse online principal component can not
                        only process the real-time updated data set and
                        stream data set, but also obtain the sparse
                        solution of the updated data set.
SPC                     The sparse principal component can obtain
                        sparse solutions of the eigenmatrix to better
                        explain the relationship between principal
                        components and original variables.
