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Published online by Cambridge University Press: 01 January 2025
Four methods of determining the clusters in a correlation matrix are described and compared. The choice of method has to be made according to the size of the matrix and the type of cluster sought. The relativity of clusters is emphasized and a distinction is drawn between phenomenal clusters and nuclear clusters. The relative utility of clusters and factors is briefly commented upon.
The research from which these observations primarily arise was directed to discovering the basic factors in 171 personality variables (4) This very comprehensive list of variables was first resolved into 35 clusters, of from three to ten variables in each, and which included all but two of the original 171 variables. The 35 cluster variables were then assessed in relation to a larger population than could be rated and handled with accuracy for the 171 variables, and the inter-correlations factored into some eleven factors (5).