| 类别数量 | 组内平方(SE) | Calinski-Harabaz Index |
| 2 | 890,571.91 | 3269.72 |
| 3 | 703,357.36 | 3429.47 |
| 4 | 626,145.39 | 3703.37 |
| 5 | 566,718.18 | 4189.85 |
| 6 | 517,192.62 | 3723.90 |