Significant Cluster Analysis
Description
A complimentary package for use with hclust; simprof tests
to see which (if any) clusters are statistically different. The
null hypothesis is that there is no a priori group structure.
See Clarke, K.R., Somerfield, P.J., and Gorley R.N. 2008.
Testing of null hypothesis in exploratory community analyses:
similarity profiles and biota-environment linkage. J. Exp. Mar.
Biol. Ecol. 366, 56-69.