The purpose of the current project is to present three empirical studies that illustrate the application of advanced latent class modeling techniques for crosssectional and longitudinal data to research questions about gambling and substance use. The first empirical study used latent class analysis and conditional latent class analysis to identify and predict types of college-student gamblers u...

The purpose of this dissertation is to present a new psychometric model that combines a Mixture Rasch model with a diagnostic model. We refer to this model as a diagnostic classification mixture Rasch model (DCMixRM). The motivation for the development of the DCMixRM is twofold. First, the DCMixRM is designed to provide rigorous explanation as to factors that are potentially causing the latent ...

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web search engines are one of the most popular tools on the internet which are widely-used by expert and novice users. constructing an adequate query which represents the best specification of users’ information need to the search engine is an important concern of web users. query expansion is a way to reduce this concern and increase user satisfaction. in this paper, a new method of query expa...

Latent class analysis can identify unmeasured mutually exclusive categories (class membership) among participants for either observed categorical or continuous variables. More recently, latent class analysis has been applied to accelerometry to better understand the day-to-day patterns of physical activity and sedentary behavior. Typically, the class assignments are only relevant to the study f...

Previous research by Tucker et al. (2007), working with the Consumer Expenditure Interview Survey (CE), explores the efficacy of measurement error indicators such as: interview length, extent and type of records used, the monthly patterns of reporting, and income question missing in a latent construct. Later research by Tucker, Meekins, and Biemer (2008) extend this latent class model to includ...