Table 2.
Mahalanobis' distance test comparing KNM-WT 40000 and BRT-VP-3/1 with hominin species using all PCs combined. PrD, Procrustes distance; D2, squared Mahalanobis' distance; SDU, standard deviation units; d.f., degrees of freedom (equal number of non-zero PCs); p-value, probability that either of the two fossils belongs to the species. All differences but one (n.s.) are statistically significant at p < 0.05.
| PrD | D2 | SDU | d.f. | p-value | |
|---|---|---|---|---|---|
| KNM-WT 40000 | |||||
| A. afarensis | 0.22515 | 22.078 | 4.698 | 6 | <0.0025 |
| A. africanus | 0.20090 | 37.108 | 6.091 | 4 | <0.0005 |
| P. robustus | 0.14777 | 13.263 | 3.641 | 6 | <0.05 |
| BRT-VP3/1 (a) | |||||
| A. afarensis | 0.17096 | 12.569 | 3.545 | 6 | <0.05 |
| A. africanus | 0.13526 | 22.284 | 4.72 | 4 | <0.0005 |
| P. robustus | 0.38327 | 32.278 | 5.681 | 6 | <0.0005 |
| BRT-VP3/1 (b) | |||||
| A. afarensis | 0.18015 | 13.895 | 3.727 | 6 | <0.05 |
| A. africanus | 0.09503 | 9.184 | 3.03 | 4 | <0.1 (n.s.) |
| P. robustus | 0.32341 | 18.329 | 4.281 | 6 | <0.005 |