METHOD | ABBREVIATION | INTERVAL VALUES | BEST VALUES FOR k CHOICE | REFERENCE |
Silhouette | SL values | [−1, 1] | Higher values | [24] |
Calinski-Harabasz | CH index | [0, ∞) | Higher values | [25] |
Davies-Bouldin | DB index | [0, ∞) | Lowest values | [26] |