Diagonal is sum of variances In general, these will be larger when “within” class variance is larger (a bad thing) Sw(iris[,1:4],iris[,5]) Sepal.Length.

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Presentation transcript:

Diagonal is sum of variances In general, these will be larger when “within” class variance is larger (a bad thing) Sw(iris[,1:4],iris[,5]) Sepal.Length Sepal.Width Petal.Length Petal.Width Sepal.Length Sepal.Width Petal.Length Petal.Width

When clusters are far apart their means are far from the global mean The differences between the means grow