ABSTRACT Title of Dissertation: THE MULTIDIMENSIONAL GENERALIZED GRADED UNFOLDING MODEL FOR ASSESSING CHANGE IN REPEATED MEASURES
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چکیده
Title of Dissertation: THE MULTIDIMENSIONAL GENERALIZED GRADED UNFOLDING MODEL FOR ASSESSING CHANGE IN REPEATED MEASURES Weiwei Cui Doctor of Philosophy, 2008 Directed by: Associate Professor James S. Roberts Department of Psychology A multidimensional extension of the generalized graded unfolding model for repeated measures (GGUM-RM) is introduced and applied to analyze attitude change across time using responses collected by a Thurstone or Likert questionnaire. The model conceptualizes the change across time as separate latent variables and provides direct estimates of both individual and group change while accounting for the dependency among latent variables. The parameters and hyperparameters of GGUM-RM are estimated by fully Bayesian estimation method via WinBUGS. The accuracy of the estimation procedure is demonstrated by a simulation study, and the application of the GGUM-RM is illustrated by the analysis of attitude change toward abortion among college students. THE MULTIDIMENSIONAL GENERALIZED GRADED UNFOLDING MODEL FOR ASSESSING CHANGE IN REPEATED MEASURES
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