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Generalized Processing Tree Models: Jointly Modeling Discrete and Continuous Variables

Published online by Cambridge University Press:  01 January 2025

Daniel W. Heck*
Affiliation:
University of Mannheim
Edgar Erdfelder
Affiliation:
University of Mannheim
Pascal J. Kieslich
Affiliation:
University of Mannheim
*
Correspondence should be made to Daniel W. Heck, Department of Psychology, University of Mannheim, L 13, 17, Mannheim 68161, Germany. Email: heck@uni-mannheim.de

Abstract

Multinomial processing tree models assume that discrete cognitive states determine observed response frequencies. Generalized processing tree (GPT) models extend this conceptual framework to continuous variables such as response times, process-tracing measures, or neurophysiological variables. GPT models assume finite-mixture distributions, with weights determined by a processing tree structure, and continuous components modeled by parameterized distributions such as Gaussians with separate or shared parameters across states. We discuss identifiability, parameter estimation, model testing, a modeling syntax, and the improved precision of GPT estimates. Finally, a GPT version of the feature comparison model of semantic categorization is applied to computer-mouse trajectories.

Information

Type
Original Paper
Copyright
Copyright © 2018 The Psychometric Society

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