calinski-hrabasz f index for hierarchical clustering

Question

How do I compute the calinski-hrabasz f index in R for hierarchical clustering? I need it to determine the optimal amounts of clusters.

Answer 1

R Package FPC might be the way to go.

calinhara(x,clustering,cn=max(clustering))

Description Calinski-Harabasz index for estimating the number of clusters, based on an observations/variablesmatrix here. A distance based version is available through cluster.stats.