Generalized Processing Tree Models: Jointly Modeling Discrete and Continuous Variables |
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Authors: | Daniel W Heck Edgar Erdfelder Pascal J Kieslich |
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Institution: | 1.Department of Psychology,University of Mannheim,Mannheim,Germany |
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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. |
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