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. 2014 Oct 24;9(10):e110729. doi: 10.1371/journal.pone.0110729

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.