While drawing graphs that compare the silhouette measure of different clustering algorithms, what unit should I specify for the silhouette width?
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Don't use the Silhouette measure for arbitrary clustering algorithms. In particular, don't use it for clustering algorithms which can produce non-convex clusters. On data sets such as this: https://en.wikipedia.org/wiki/File:SLINK-density-data.svg the silhouette may be misleading. The silhouette coefficient and silhouette plots are meant to compare different results of the same, convex, clustering algorithm (e.g. k-means). |
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