Does anybody know if any package calculates the cubic clustering criterion (CCC) index in R to aid the selection of optimal number of clusters?

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#### Best Answer

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") `