| fraction_variance_explained | Fraction of variance explained |
| fraction_variance_explained_perPC | Fraction of variance explained per PC |
| mspca | Multiple Sparse PCA |
| orthogonality_violation | Orthogonality constraint violation |
| pairwise_correlation | Pairwise correlation |
| print_mspca | Print mspca output |
| tpw | Truncated Power Method |
| variance_explained_perPC | Variance explained per PC |