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Some Rao-Guttman Relationships

Published online by Cambridge University Press:  01 January 2025

Chester W. Harris
Chester W. Harris*
Affiliation:
University of Wisconsin
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Abstract

An examination of the determinantal equation associated with Rao's canonical factors suggests that Guttman's best lower bound for the number of common factors corresponds to the number of positive canonical correlations when squared multiple correlations are used as the initial estimates of communality. When these initial communality estimates are used, solving Rao's determinantal equation (at the first stage) permits expressing several matrices as functions of factors that differ only in the scale of their columns; these matrices include the correlation matrix with units in the diagonal, the correlation matrix with squared multiple correlations as communality estimates, Guttman's image covariance matrix, and Guttman's anti-image covariance matrix. Further, the factor scores associated with these factors can be shown to be either identical or simply related by a scale change. Implications for practice are discussed, and a computing scheme which would lead to an exhaustive analysis of the data with several optional outputs is outlined.

Type
Original Paper
Information
Psychometrika , Volume 27 , Issue 3 , September 1962 , pp. 247 - 263
Copyright
Copyright © 1962 The Psychometric Society

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