Table 2. Nested Procrustes ANOVA on shape for device comparison.
We applied the following nested hierarchical structure: Specimen > Device > Operator > Landmark replica. (A) All datasets. (B) Only scanner-based datasets. (C) Only digitizer-based datasets. The R-squared values (Rsq) give an estimate of the relative contribution of each factor to the total shape variation. Repeatabilities are for landmark replica only.
| Variables | Df | SS | MS | Rsq | F | Z | Pr(>F) | R |
|---|---|---|---|---|---|---|---|---|
| A. Device Comparison Dataset | ||||||||
| Specimen | 21 | 0.602 | 0.030 | 0.924 | 272.705 | 21.092 | 0.001 | |
| Specimen:Device | 22 | 0.016 | 0.001 | 0.025 | 6.916 | 26.363 | 0.001 | |
| Specimen:Device:Operator | 44 | 0.025 | 0.001 | 0.037 | 5.260 | 27.812 | 0.001 | |
| Residuals (Landmark replica) | 88 | 0.010 | 0.000 | 0.014 | ||||
| Total | 175 | 0.671 | ||||||
| B. Device Comparison Dataset: Scanner | ||||||||
| Specimen | 21 | 0.316 | 0.015 | 0.954 | 114.059 | 17.562 | 0.001 | 0.983 |
| Specimen:Operator | 22 | 0.009 | 0.000 | 0.028 | 3.230 | 24.287 | 0.001 | |
| Residuals (Landmark replica) | 44 | 0.006 | 0.000 | 0.018 | ||||
| Total | 87 | 0.332 | ||||||
| C. Device Comparison Dataset: Digitizer | ||||||||
| Specimen | 21 | 0.315 | 0.015 | 0.942 | 177.721 | 19.191 | 0.001 | 0.989 |
| Specimen:Operator | 22 | 0.016 | 0.001 | 0.047 | 8.441 | 25.747 | 0.001 | |
| Residuals (Landmark replica) | 44 | 0.004 | 0.000 | 0.011 | ||||
| Total | 87 | 0.334 | ||||||