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Parallel factor analysis of gait waveform data: a multimode extension of principal component analysis

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Title: Parallel factor analysis of gait waveform data: a multimode extension of principal component analysis
Author(s): Helwig, Nathaniel
Advisor(s): Hong, Sungjin
Department / Program: Psychology
Discipline: Psychology
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.A.
Genre: Masters
Subject(s): Walking Locomotion Multivariate analysis Principal Component Analysis Parallel Factor Analysis
Abstract: Gait data are typically collected in multivariate form, so some multivariate analysis is often used to understand interrelationships between observed data. Principal Component Analysis (PCA), a data reduction technique for correlated multivariate data, has been widely applied by gait analysts to investigate patterns of association in gait waveform data (e.g., interrelationships between joint angle waveforms from different subjects and/or joints). Despite its widespread use in gait analysis, PCA is for two-mode data, whereas gait data are often collected in higher-mode form. In this paper, we present the benefits of analyzing gait data via Parallel Factor Analysis (Parafac), which is a component analysis model designed for three- or higher-mode data. Using three-mode joint angle waveform data (subjects × time × joints), we demonstrate Parafac’s ability to (a) determine interpretable components revealing the primary interrelationships between lower-limb joints in healthy gait and (b) identify interpretable components revealing the fundamental differences between normal and perturbed subjects’ gait patterns across multiple joints. Our results offer evidence of the complex interconnections that exist between lower-limb joints and limb segments in both normal and abnormal gaits, confirming the need for the simultaneous analysis of multi-joint gait waveform data (especially when studying perturbed gait patterns).
Issue Date: 2012-02-01
Genre: thesis
URI: http://hdl.handle.net/2142/29560
Rights Information: Copyright 2011 Nathaniel E. Helwig
Date Available in IDEALS: 2014-02-01
Date Deposited: 2011-12
 

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