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Two validity measures tested for selecting an appropriate number of clusters.
| Number of clusters | Silhouette index | Davies–Bouldin index |
|---|---|---|
| 3 | 0.4212 | 0.1721 |
| 4 | 0.4961 | 0.1281 |
| 5 | 0.5007 | 0.0998 |
| 6 | 0.6741 | 0.0954 |
| 7 | 0.8311 | 0.0704 |
| 8 | 0.8019 | 0.0731 |
| 9 | 0.7702 | 0.0782 |
