Table 2. Repeated measures ANOVA.
Source | Type III Sum of Squares | df | Mean Square | F | Sig. |
Pointer | 3.334 | 1 | 3.334 | 1.005 | .390 |
Error(pointer) | 9.950 | 3 | 3.317 | ||
Location | 33.379 | 2 | 16.689 | 4.280 | .070 |
Error(location) | 23.399 | 6 | 3.900 | ||
Orientation | 48.189 | 7 | 6.884 | 4.685 | .003 |
Error(orientation) | 30.860 | 21 | 1.470 | ||
Pointer * location | .337 | 2 | .168 | .070 | .933 |
Error(pointer*location) | 14.443 | 6 | 2.407 | ||
Pointer * orientation | 7.732 | 7 | 1.105 | 2.578 | .044 |
Error(pointer*orientation) | 8.998 | 21 | .428 | ||
Location * orientation | 26.083 | 14 | 1.863 | 1.491 | .157 |
Error(location*orientation) | 52.472 | 42 | 1.249 | ||
Pointer * location * orientation | 10.442 | 14 | .746 | 1.183 | .323 |
Error(pointer*location*orientation) | 26.476 | 42 | .630 |
Full factorial 2 (stimuli) x 3 (reference positions) x 8 (surround's orientations) ANOVA with repeated measured confirms no significant difference between biases induced on a segment or on a dot. The only significant effect is exerted by annulus' orientation and by the interaction of annulus' tilt with pointer type.