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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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What algorithm does ward.D in hclust() implement if it is not Ward's criterion?
I came across the research paper that corresponds to the objective function that is being optimized by "Ward1 (ward.D)": Hierarchical Clustering via Joint Between-Within Distances: Extending Ward's Mi …