134 Chapter 6 Figure S.6.8.1. Simplified illustrations of the concepts of convexity and convex hull. A shape is convex if you can connect any two points (e.g. x and y) within the shape, while the connecting line (orange) is also always within the shape. If this is not possible the shape is concave. A convex hull (red) is the smallest convex set that contains the shape (blue). Figure S.6.8.2. The Dunn index is shown on the y-axis, and on the x-axis the number of clusters/ subgroups is shown. The Dunn index should be maximized for an optimal number of groups. The red line indicates 15 groups, which is the number of groups used in the analysis. ks, number of clusters; DI, Dunn index.
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