Five external criteria were used to evaluate the extent of recovery of the true structure in a hierarchical clustering solution. The results of the study indicated that the Hubert and Arabie adjusted Rank index was best suited to the task of comparison across hierarchy levels. (Author/LMO)

A measure for the quantification of the changes in classification under small changes in data is proposed. (Author)

In this study assumptions are made concerning the amount of clustering in sequences containing runs of equivalent elements. It is assumed that any valid clustering measure is linear with respect to union of runs and monotone increasing under iterations of clustering operators. With these two assumptions it follows that any such measure is of…

Variations in sorts of rural Mexican-Spanish "have" verbs were analyzed using two approaches: one which measures subject differences from a standard categorization, and another which directly compares pairs of individual subject's sorts. "The second approach revealed a consistent structure for a subset of the subjects not revealed…

Research on 128 children is presented as evidence of the superiority of a new clustering measure (X) over a more traditional "chance clustering" measure (sigma) as a means of organizing material to be learned to facilitate recall. X is shown to meet three criteria for a measure of a developmental process: X is more highly correlated with recall…