when nbclust is run what is cluster d index nbclust plot nblust graph definition which is the optimal number of clusters how to interpret ndclust what is the graph method for determining clusters what is the d index of the network of clusters what is nbclust plot what is significant peak in d index plot what is the best range to plot clusters in a plot for a data titration? how to interpret graph what is d index what is d index in nbclust what are nclust plots? the nbclust plot is a method for determining the number of clusters. how many clusters does nblust determine what is nbclust what is nclust when the number of clusters nclust is optimal,