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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.
index = "ccc"
I_ccc <- NbClust(X, distance="euclidean", min.nc=2, max.nc=8, method = "complete",
index = "ccc")