This is one of a few functions created by Joe Cauteruccio, Jessie Li, Andrew West of Yale University that are used together to create the hclust_eval() function.
The merge value produced by hclust(). This is an n-1 by 2 matrix that descirbes merging of cluster at every step of clustering, with negative values meaning that observations were merged at the stage and not before. From documentation: "Thus negative entries in merge indicate agglomerations of singletons, and positive entries indicate agglomerations of non-singletons."
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