Does anybody know if any package calculates the cubic clustering criterion (CCC) index in R to aid the selection of optimal number of clusters?
It is included in
NbClust and to be used via the option
index = "ccc", e. g.
I_ccc <- NbClust(X, distance="euclidean", min.nc=2, max.nc=8, method = "complete", index = "ccc")