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Ward's method is one of "linkage rules" in hierarchical agglomerative cluster analysis. In Ward's method, those two clusters are chosen to merge at each step that would yield the lowest increase in error sum of squares.

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Difference Between Cubic Clustering Criterion, Silhouette Score, and Calinski Harabasz

My candidates algorithms are Ward, DBSCAN and BIRCH. I am looking for a good validation criterion to determine the quality of the clustering output. …
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