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arXiv · 0812.1804

Approximate factor analysis model building via alternating I-divergence minimization

Lorenzo Finesso·Peter Spreij
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Abstract

Given a positive definite covariance matrix $\widehat \Sigma$, we strive to construct an optimal \emph{approximate} factor analysis model $HH^\top +D$, with $H$ having a prescribed number of columns and $D>0$ diagonal. The optimality criterion we minimize is the I-divergence between the corresponding normal laws. Lifting the problem into a properly chosen larger space enables us to derive an alternating minimization algorithm \`a la Csisz\'ar-Tusn\'ady for the construction of the best approximation. The convergence properties of the algorithm are studied, with special attention given to the case where $D$ is singular.

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Lorenzo Finesso, Peter Spreij. 2008-12-09. Approximate factor analysis model building via alternating I-divergence minimization. https://doi.org/10.1007/s11336-015-9486-5

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