Table 1.

Confusion matrix for K-means with 4 classes: tumor core, high density margin, low density margin and healthy tissue.

	Predicted Core	Predicted HD Margin	Predicted LD Margin	Predicted Healthy
True Core (10)	8 (80%) σ = 0	1.9 (19%) σ = 0.31	0 (0%) σ = 0	0.1 (1%) σ = 0.31
True HD Margin (24)	1.3 (5%) σ =  0.5	7.1 (30%) σ = 0.32	9.7 (40%) σ = 0.48	5.9 (25%) σ = 0.32
True LD Margin (9)	0 (0%) σ = 0	0.1 (1%) σ = 0.31	5.6 (62%) σ = 0.52	3.3 (37%) σ = 0.48
True Healthy (7)	0 (0%) σ = 0	0 (0%) σ = 0	1 (14%) σ = 0	6 (86%) σ = 0

Statistics (average, standard deviation) result from 20 predictions. In each cell, from left to right: number of instances, percentage of total class population and standard deviation.