Table 4.
ANOVA between groups and images. Measure: SKEWNESS
| Source | df | Mean square | F | Significance |
| GROUP | 2 | 1.194 | 674.005 | 0.000 |
| Error(GROUP) | 6 | 0.002 | ||
| IMAGE | 6 | 0.538 | 53.857 | 0.000 |
| Error(IMAGE) | 18 | 0.010 | ||
| GROUP * IMAGE | 12 | 0.733 | 66.844 | 0.000 |
| Error(GROUP*IMAGE) | 36 | 0.011 |
ANOVA for a mixed design with repeated measures using four independent random one quarter fractional estimates per image of the skewness of the pixel luminance distribution across the cup floor. (The group variable represents the three clinical groups of normal, low tension glaucoma, and primary open angle glaucoma.)