Clustan Graphics3 Interactive Graphics for Cluster Analysis

ClustanGraphics3 is a new interactive program for hierarchical cluster analysis. It can display shaded representations of proximity matrices, dendrograms and scatterplots for 11 clustering methods, with an intuitive user interface and new optimization features. Algorithms are proposed which optimize the rank correlation of the proximity matrix by seriation, compute cluster exemplars and truncate a large dendrogram and proximity matrix. ClustanGraphics3 is illustrated by a market segmentation study for automobiles and a taxonomy of 20 species based on the amino acids in their protein cytochrome-c molecules. The paper concludes with an overview.