Table 1.
PCA loadings on PC1 for the different bone lengths, measured on X-ray images for 56 animals
| Variable | Loading | Scaling factor | Allometry |
|---|---|---|---|
| Tarsus | 0.984 | 1.15 | 1 |
| Tibiofibula | 0.982 | 1.14 | 1 |
| Femur | 0.988 | 1.15 | 1 |
| Urostyle | 0.973 | 1.13 | 1 |
| Radioulna | 0.870 | 1.01 | 1 |
| Cranial width | 0.954 | 1.11 | 1 |
| Cranial length | 0.334 | 0.39 | < 1 |
| Humerus | 0.965 | 1.12 | 1 |
| Snout–vent | 0.978 | 1.14 | 1 |
From these loadings, a multivariate scaling factor could be calculated for each length. ‘1’ indicates a mathematical positive scaling exponent that is not significantly different from one, and ‘< 1’ indicates a positive scaling exponent significantly smaller than one.