Table 2. Median angle between PCA subspaces for different data preprocessing methods.
| Affine, Gauss08 | Affine, Gauss12 | Deformable, Gauss08 | Deformable, Gauss12 | |
|---|---|---|---|---|
| Brainstem | 46° | 43° | 42° | 43° |
| Cerebellum | 55° | 44° | 54° | 38° |
| Whole brain | 55° | 45° | 55° | 35° |
| Pons | 44° | 45° | 40° | 43° |
| Thalamus | 66° | 43° | 50° | 43° |
PCA, principal component analysis.
The angle is estimated using 500 bootstrap replications and the first three PCs included in the discrimination analysis.