Estimates the optimal number of clusters using the Silhouette criterion when silhouette statistics already exists.
optimalSilhouette(silStats)
Silhouette statistics for each possible tested number of clusters.
The optimal number of clusters.
Rousseeuw PJ (1987) Sihouettes: a graphical aid to the interpretation and validation of cluster analysis. Journal of Computational and Applied Mathematics 20:53<U+2013>65