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Browsing by Author "Ten Berge, Jos M. F."

Now showing 1 - 3 of 3
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    A constrained PARAFAC method for positive manifold data
    (1992) Krijnen, Wim P.; Ten Berge, Jos M. F.
    A set of non-negatively correlated variables, referred to as positive manifold data, display a peculiar pattern of loadings in principal components analysis (PCA). If a small set of principal components is rotated to a simple structure, the variables correlate positively with all components, thus displaying positive manifold. However, this phenomenon is critically dependent on the freedom of rotation, as is evident from the unrotated loadings. That is, although the first principal component is without contrast (which means that all variables correlate either positively or negatively with the first component), subsequent components have mixtures of positive and negative loadings-which means that positive manifold is absent. PARAFAC is a generalization of PCA that has unique components, which means that rotations are not allowed. This paper examines how PARAFAC behaves when applied to positive manifold data. It is shown that PARAFAC does not always produce positive manifold solutions. For cases in which PARAFAC does not produce a positive manifold solution, a constrained PARAFAC method is offered that restores positive manifold by introducing non-negativity constraints. Thus, noncontrast PARAFAC components can be found that explain only a negligible amount of variance less than the PARAFAC components. These noncontrast components cannot be degenerate and cannot be partially unique in the traditional sense. Index terms: degenerate components; noncontrast components; non-negativity constraints; PARAFAC; positive manifold.
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    Correction of an orthogonal procrustes rotation procedure described by Guilford and Hoepfner
    (1989) Ten Berge, Jos M. F.
    Index terms: factor matching, least-squares rotation, target rotation.
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    Cross-validation of the WISC-R factorial structure using three-mode principal components analysis and perfect congruence analysis
    (1987) Kroonenberg, Pieter M.; Ten Berge, Jos M. F.
    By using three-mode principal components analysis and perfect congruence analysis in conjunction, the factorial structure of the 11 correlation matrices of the Wechsler Intelligence Scale for Children-Revised was analyzed within a single framework. This allows a unified description showing both the strong similarities between the standardization samples and some small differences related to age. Furthermore, claims about comparability between the WISC-R factorial structure, the structures of other independently conducted studies, and those of several translations of the WISC-R were evaluated. Again the overall similarity was striking, albeit most studies showed lower explained variances. Some age effects seemed to be present here as well. The contribution of three-mode principal components analysis was found to lie primarily in the simultaneous analysis of the standardization samples, while perfect congruence analysis allowed the evaluation of the strengths and the correlations of the common WISC-R components in all studies without encountering rotation problems.