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Survey informatics leverages two separate but vital areas of research--survey methodology and computer science and engineering--to advance the state of the art in each and improve our understanding of the human experience.
Previous research by Kandel  and others indicates that adolescent drug use follows a progression from legal drugs, through marijuana, to hard drugs. In this study of drug use patterns, institutionalized delinquents were found to follow a similar progression of drug use. Unlike previous studies which used "rule of thumb" methods of model assessment, this… (More)
This paper examines methods for integrating latent class models with association and conditional association models, including those in multiple groups. These methods are shown to be generalizable to a wide range of association models in which one or more variables is latent and shown to be especially well suited to modeling temporal changes (tends) in… (More)