| 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 |