Visualisation of Cluster Analysis

martinfleischmann.net

File this under "why didn't it exist already!?" I remember way back in my grad school days we had the conversation "how do you know how many clusters to use?" and my stat professor said, roughly, "just do what seems to fit the data." Since then I had never seen a simple explanation of a quantitative approach to this question, and loved reading this very straightforward post on it.

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