| alpha_PCA | Statistical Inference for High-Dimensional Matrix-Variate Factor Model |
| KMHFA | Estimating the Pair of Factor Numbers via Eigenvalue Ratios or Rank Minimization. |
| KPCA | Estimating the Pair of Factor Numbers via Eigenvalue Ratios Corresponding to alpha-PCA |
| KPE | Estimating the Pair of Factor Numbers via Eigenvalue Ratios Corresponding to PE |
| MHFA | Matrix Huber Factor Analysis |
| PE | Projected Estimation for Large-Dimensional Matrix Factor Models |