| IPC | The incremental principal component method can handle online data sets. |
| IPCR | Incremental Principal Component Regression for Online Datasets |
| PCR | Principal Component Regression (PCR) |
| PPC | The perturbation principal component method can handle online data sets. |
| PPCR | Perturbation-based Principal Component Regression |
| SAPC | The stochastic approximate component method can handle online data sets. |
| SPCR | Stochastic Principal Component Regression |
| spcrl | The stochastic principal component regression with varying learning-rate can handle online data sets. |