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Functional Parallel Factor Analysis for Functions of One- and Two-dimensional Arguments

Published online by Cambridge University Press:  01 January 2025

Ji Yeh Choi*
Affiliation:
McGill University
Heungsun Hwang
Affiliation:
McGill University
Marieke E. Timmerman
Affiliation:
University of Groningen
*
Correspondence should be made to JiYeh Choi andHeungsunHwang, Department of Psychology, McGill University, 1205 Dr. Penfield Avenue, Montreal, QC H3A 1B1 Canada. Email: ji.yeh.choi@mail.mcgill.ca

Abstract

Parallel factor analysis (PARAFAC) is a useful multivariate method for decomposing three-way data that consist of three different types of entities simultaneously. This method estimates trilinear components, each of which is a low-dimensional representation of a set of entities, often called a mode, to explain the maximum variance of the data. Functional PARAFAC permits the entities in different modes to be smooth functions or curves, varying over a continuum, rather than a collection of unconnected responses. The existing functional PARAFAC methods handle functions of a one-dimensional argument (e.g., time) only. In this paper, we propose a new extension of functional PARAFAC for handling three-way data whose responses are sequenced along both a two-dimensional domain (e.g., a plane with x- and y-axis coordinates) and a one-dimensional argument. Technically, the proposed method combines PARAFAC with basis function expansion approximations, using a set of piecewise quadratic finite element basis functions for estimating two-dimensional smooth functions and a set of one-dimensional basis functions for estimating one-dimensional smooth functions. In a simulation study, the proposed method appeared to outperform the conventional PARAFAC. We apply the method to EEG data to demonstrate its empirical usefulness.

Information

Type
Original Paper
Copyright
Copyright © 2017 The Psychometric Society

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