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Sparse Exploratory Factor Analysis

Published online by Cambridge University Press:  01 January 2025

Nickolay T. Trendafilov*
Affiliation:
Open University
Sara Fontanella
Affiliation:
Imperial College London
Kohei Adachi
Affiliation:
Osaka University
*
Correspondence should be made to Nickolay T. Trendafilov, School of Mathematics and Statistics, Open University, Milton Keynes, UK. Email: Nickolay.Trendafilov@open.ac.uk

Abstract

Sparse principal component analysis is a very active research area in the last decade. It produces component loadings with many zero entries which facilitates their interpretation and helps avoid redundant variables. The classic factor analysis is another popular dimension reduction technique which shares similar interpretation problems and could greatly benefit from sparse solutions. Unfortunately, there are very few works considering sparse versions of the classic factor analysis. Our goal is to contribute further in this direction. We revisit the most popular procedures for exploratory factor analysis, maximum likelihood and least squares. Sparse factor loadings are obtained for them by, first, adopting a special reparameterization and, second, by introducing additional \documentclass[12pt]{minimal}\usepackage{amsmath}\usepackage{wasysym}\usepackage{amsfonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlength{\oddsidemargin}{-69pt}\begin{document}$$\ell _1$$\end{document}-norm penalties into the standard factor analysis problems. As a result, we propose sparse versions of the major factor analysis procedures. We illustrate the developed algorithms on well-known psychometric problems. Our sparse solutions are critically compared to ones obtained by other existing methods.

Information

Type
Original paper
Copyright
Copyright © 2017 The Psychometric Society

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