Combine Categories Using Greenacre's Method
Implements a method of iteratively collapsing the rows of a
contingency table, two at a time, by selecting the pair of categories whose
combination yields a new table with the smallest loss of chi-squared, as
described by Greenacre, M.J. (1988) . The result is
compatible with the class of object returned by the 'stats' package's
hclust() function and can be used similarly (plotted as a dendrogram,
cut, etc.). Additional functions are provided for automatic cutting and
diagnostic plotting.