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A dendrogram (from Greek dendron "tree", -gramma "drawing") is a tree diagram frequently used to illustrate the arrangement of the clusters produced by hierarchical clustering. Dendrograms are often used in computational biology to illustrate the clustering of genes.

For a clustering example, suppose this data is to be clustered using Euclidean distance as the distance metric.

Raw data

The hierarchical clustering dendrogram would be as such:

Traditional representation

Here the top row of nodes represent data, and the remaining nodes represent the clusters to which the data belong, and the arrows represent the distance.

See also

• cladogram
• hierarchical clustering