| pca | Principal Component Analysis (Custom Scree Style) |
| pcreg | Principal Component Regression (PCR) |
| robust_pca | Robust Principal Component Analysis (Robust PCA) |
| robust_pcreg | Robust Principal Component Regression (Robust PCR) |
| sparse_pca | Sparse Principal Component Analysis (Sparse PCA) |
| sparse_pcreg | Sparse Principal Component Regression (Sparse PCR) |
| supervised_pca | Supervised Principal Component Analysis (SPCA) |
| supervised_pcreg | Supervised Principal Component Regression |