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Table 3. 
Distance-Based Cluster Evaluation Metrics
 Number of Clusters
234
Calinski–Harabasz index 74.88 20.31 24.72 
Davies–Bouldin index 2.13 7.32 24.82 
Silhouette index 0.17 −0.05 −0.21 
 Number of Clusters
234
Calinski–Harabasz index 74.88 20.31 24.72 
Davies–Bouldin index 2.13 7.32 24.82 
Silhouette index 0.17 −0.05 −0.21 

For the Calinski–Harabasz and Silhouette indices, higher values indicate a greater separation between clusters. For the Davies–Bouldin index, lower values indicate greater cluster separation.

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