dm.cs.tu-dortmund.de/en/mlbits/cluster-evaluation-intrinsic/
Intrinsic Evaluation of Clusterings – Lecture Notes
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Explained variance \(R^2:=\text{BCSS}\big/\text{TSS}=(\text{TSS}-\text{WCSS})\big/\text{TSS}\in [0,1]\)
Sum-of-Squares Decomposition, k Hypothetical Clusters
Recall theorem of König, Huygens, and Steiner …
