Abstract
Single linkage clusters on a set of points are the maximal connected sets in a graph constructed by connecting all points closer than a given threshold distance. The complete set of single linkage clusters is obtained from all the graphs constructed using different threshold distances. The set of clusters forms a hierarchical tree, in which each non-singleton cluster divides into two or more subclusters; the runt size for each single linkage cluster is the number of points in its smallest subcluster. The maximum runt size over all single linkage clusters is our proposed test statistic for assessing multimodality. We give significance levels of the test for two null hypotheses, and consider its power against some bimodal alternatives.
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