Heart                   Heart failure
Hugging                 Hugging
IPC                     The incremental principal components can handle
                        data sets that are updated in real time and
                        streaming data.
OPC                     The online principal component method refers to
                        the IPC method with the best performance among
                        the IPC, the PPC and the SAPC methods.
PC                      The traditional principal component method.
                        This method can estimate the eigen space of the
                        data set.
PPC                     The perturbation principal components can
                        handle data sets that are updated in real time
                        and streaming data.
PSA                     Prostate Specific Antigen
SAPC                    The stochastic approximation principal
                        components can handle data sets that are
                        updated in real time and streaming data.
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.
