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Selection of the number of clusters using the Calinski-Harabasz Index (VRC).
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
|---|---|---|---|---|---|---|---|---|
| S2B | 0.568 | 0.897 | 0.938 | 1.012 | 1.113 | 1.184 | 1.173 | |
| S2W | 0.694 | 0.412 | 0.349 | 0.301 | 0.264 | 0.232 | 0.209 | |
| VRC | 88.3919 | 155.886 | 143.791 | 143.227 | 148.948 | 153.869 | 147.327 | |
S2B, between-cluster variance; S2W, within-cluster variance.
