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Psychometrika

, Volume 60, Issue 2, pp 221–245 | Cite as

Maximization of sums of quotients of quadratic forms and some generalizations

  • Henk A. L. Kiers
Article

Abstract

Monotonically convergent algorithms are described for maximizing six (constrained) functions of vectors x, or matricesX with columns x1, ..., x r . These functions are h1(x)=Σ k (x′Akx)(x′Ckx)−1, H1(X)=Σ k tr (X′AkX)(X′CkX)−1, h1(X)=Σ k Σ l (x′ l Akx l ) (x′ l Ckx l )−1 withX constrained to be columnwise orthonormal, h2(x)=Σ k (x′Akx)2(x′Ckx)−1 subject to x′x=1, H2(X)=Σ k tr(X′AkX)(X′AkX)′(X′CkX)−1 subject toX′X=I, and h2(X)=Σ k Σ l (x′ l Akx l )2 (x′ l CkX l )−1 subject toX′X=I. In these functions the matricesCk are assumed to be positive definite. The matricesAk can be arbitrary square matrices. The general formulation of the functions and the algorithms allows for application of the algorithms in various problems that arise in multivariate analysis. Several applications of the general algorithms are given. Specifically, algorithms are given for reciprocal principal components analysis, binormamin rotation, generalized discriminant analysis, variants of generalized principal components analysis, simple structure rotation for one of the latter variants, and set component analysis. For most of these methods the algorithms appear to be new, for the others the existing algorithms turn out to be special cases of the newly derived general algorithms.

Key words

generalized principal components analysis generalized discriminant analysis binormamin simple structure rotation 

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Copyright information

© The Psychometric Society 1995

Authors and Affiliations

  • Henk A. L. Kiers
    • 1
  1. 1.Department of Psychology (SPA)University of GroningenGroningenThe Netherlands

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