| Heart | Heart failure |
| Hugging | Hugging |
| IPC | The incremental principal component can handle online data sets with highly correlated. |
| 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 component can handle online data sets with highly correlated. |
| PSA | Prostate Specific Antigen |
| SAPC | The stochastic approximation principal component can handle online data sets with highly correlated. |
| SOPC | The sparse online principal component can not only process online data sets, but also obtain a sparse solution of online data sets. |
| SPC | The sparse principal component can obtain sparse solutions of the eigenmatrix to better explain the relationship between principal components and original variables. |