Table 3.
Bayesian Information Criterion values and, in brackets, model weights for the model-based clustering based on robust principal components for the two samples.
| Distribution | Model | Middle Eocene | Upper Eocene | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 2 | 3 | 4 | ||
| Spherical | E-- | 1574 (0.010) |
1575.5 (0.004) |
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| Spherical | V-- | 1574 (0.010) |
1649 (0.002) |
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| Diagonal | EE- | 1567 (0.227) |
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| Diagonal | VE- | 1567 (0.227) |
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| Diagonal | EV- | 1567 (0.227) |
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| Diagonal | VV- | 1567 (0.227) |
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| Ellipsoidal | EEE | 1573 (0.017) |
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| Ellipsoidal | EEV | 1573 (0.017) |
1639 (0.224) |
1648 (0.003) |
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| Ellipsoidal | VEV | 1573 (0.017) |
1637 (0.611) |
1641 (0.101) |
|||||
| Ellipsoidal | VVV | 1573 (0.017) |
1642 (0.059) |
1649 (0.002) |
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Legend: Although models for up to 10 clusters were fitted, only the first three had at least one model with non-zero weight and we only show models for up to 4 clusters in the table. The model codes relate to, in order, the volume, shape and orientation of the clusters: E denotes equal and V variable such that VEV, e.g., is a model with clusters of equal shape but different volume and orientation. BIC values and weights are only given if model weights were non-zero.