CLUSTERGRAM: Stata module to produce graph for visualizing hierarchical and non-hierarchical cluster analyses

clustergram draws a graph to examine how cluster members are assigned to clusters as the number of clusters increases in a cluster analysis. This is similar in spirit to the dendrograms (tree graphs) used for hierarchical cluster analyses. The graph is especially useful for non-hierarchical clustering algorithms, such as k-means, and for hierarchical cluster algorithms when the number of observations is too large for dendrograms to be practical.