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General Linear Model Results for Smile Intensity Estimation
| Database | ICC | F | p |
| BP4D | 0.765 | 158.206 | .00 |
| Spectrum | 0.521 | ||
| Extraction | ICC | F | p |
| Gabor | 0.602 | 17.892 | .00 |
| SIFT | 0.684 | ||
| Reduction | ICC | F | p |
| Laplacian | 0.639 | 0.197 | .66 |
| PCA | 0.648 | ||
| Prediction | ICC | F | p |
| Two-class | 0.467a | 83.360 | .00 |
| Multiclass | 0.739b | ||
| Regression | 0.724b | ||
| Interaction Effects | F | p | |
| Database × Extraction | 4.627 | .03 | |
| Database × Reduction | 3.958 | .05 | |
| Database × Model | 8.873 | .00 | |
| Reduction × Model | 13.391 | .00 | |
