Silhouette score (not currently implemented)

Calculation

Gives the ratio between the cohesiveness of a cluster and its separation from other clusters. Values for silhouette score range from -1 to 1.

Expectation and use

A good clustering with well separated and compact clusters will have a silhouette score close to 1. A low silhouette score (close to -1) indicates a poorly isolated cluster (both type I and type II error).

References

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Literature

Introduced by [Rousseeuw].

Citations

Rousseeuw

Peter J Rousseeuw. Silhouettes: A graphical aid to the interpretation and validation of cluster analysis. Journal of computational and applied mathematics, 20(C):53–65, 1987.