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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 on theme: "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."— Presentation transcript:

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2 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 0.26500816 0.09272109 0.16751429 0.03840136 Sepal.Width 0.09272109 0.11538776 0.05524354 0.03271020 Petal.Length 0.16751429 0.05524354 0.18518776 0.04266531 Petal.Width 0.03840136 0.03271020 0.04266531 0.04188163

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

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