title: Bayesian latent structure modeling of walking behavior in a physical activity intervention.
abstract: The analysis of walking behavior in a physical activity intervention is considered. A Bayesian latent structure modeling approach is proposed whereby the ability and willingness of participants is modeled via latent effects. The dropout process is jointly modeled via a linked survival model. Computational issues are addressed via posterior sampling and a simulated evaluation of the longitudinal model's ability to recover latent structure and predictor effects is considered. We evaluate the effect of a variety of socio-psychological and spatial neighborhood predictors on the propensity to walk and the estimation of latent ability and willingness in the full study.
authors.affiliation: Division of Biostatistics, Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA lawsonab@musc.edu.
authors.forename: Andrew B
authors.initials: AB
authors.lastname: Lawson
authors.affiliation: Division of Biostatistics, Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA.
authors.forename: Caitlyn
authors.initials: C
authors.lastname: Ellerbe
authors.affiliation: Division of Biostatistics, Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA.
authors.forename: Rachel
authors.initials: R
authors.lastname: Carroll
authors.affiliation: Department of Psychology, University of South Carolina, Columbia, SC, USA.
authors.forename: Kassandra
authors.initials: K
authors.lastname: Alia
authors.affiliation: Department of Psychology, University of South Carolina, Columbia, SC, USA.
authors.forename: Sandra
authors.initials: S
authors.lastname: Coulon
authors.affiliation: Department of Psychology, University of South Carolina, Columbia, SC, USA.
authors.forename: Dawn K
authors.initials: DK
authors.lastname: Wilson
authors.affiliation: Department of Psychology, University of South Carolina, Columbia, SC, USA.
authors.forename: M Lee
authors.initials: ML
authors.lastname: VanHorn
authors.affiliation: Department of Psychology, University of South Carolina, Columbia, SC, USA.
authors.forename: Sara M St
authors.initials: SM
authors.lastname: George
mesh_terms: D000368:Aged; D001499:Bayes Theorem; D015444:Exercise / Q000523:psychology*; D005081:Exercise Therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010352:Patient Dropouts; D016138:Walking / Q000523:psychology*
keywords: Bayesian; Latent structure; intervention; joint model; longitudinal data; physical activity
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