https://www.dexlabanalytics.com/blog/hierarchical-clustering-foundational-concepts-and-example-of-agglomerative-clustering


University of Michigan - Ann Arbor

Linkage between clusters can be determined in four main ways, three of which are pictured below:
- Simple: Find the pairwise dissimilarity between each pair of observations and select the most similar
- Average Linkage: Find all pairwise dissimilarities and use the mean value
- Complete Linkage: Compute pairwise dissimilarities and use the least similar 
- Centroid Linkage: Not pictured. Dissimilarity between the centroids of two clusters.

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