Dendrogram

A dendrogram is a diagram representing a tree. This diagrammatic representation is frequently used in different contexts:

in hierarchical clustering, it illustrates the arrangement of the clusters produced by the corresponding analyses.
in computational biology, it shows the clustering of genes or samples, sometimes in the margins of heatmaps.
in phylogenetics, it displays the evolutionary relationships among various biological taxa. In this case, the dendrogram is also called a phylogenetic tree.

The name dendrogram derives from the two ancient greek words δένδρον (déndron), meaning "tree", and γράμμα (grámma), meaning "drawing, mathematical figure".

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