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This volume reviews the various approaches to modeling how individuals change across time and provides methodologies and data analytic strategies for behavioral and social science researchers. This accessible guide provides concrete examples of how contextual factors can be included in research studies. The opening chapter demonstrates the various ways contextual factors are represented-as covariates, predictors, outcomes, moderators, mediators, or mediated effects. Succeeding chapters review ""best practice"" techniques for treating missing data, making model comparisons, and scaling across d

Previous research has suggested differences in the locus of control (LOC) orientations of students with intellectual disability, learning disabilities, and no disabilities, although this research has been characterized by methodological limitations. The purpose of this study was to examine the development of LOC orientations in students with intellectual disability, learning disabilities, and no disabilities using an accelerated design and a curve-of-factors modeling framework. Participants were 1,344 children and young people between the ages of 8 and 18 years who completed two measures of LOC orientations. Students with intellectual disability, at 8 years, tend to be more externally oriented than their peers with learning disabilities and no disabilities, and from 8 to 20 years, they do not significantly increase or decrease in their perceptions of their ability to exert control over their lives. Students with learning disabilities and no disabilities tend to develop more positive orientations as they age; however, this similar pattern of change was offset by initial differences in level (i.e., intercept values). The findings suggest the critical need for continued attention to developing and implementing strategies that focus on promoting the development of adaptive perceptions of control in students with disabilities, particularly students with more severe disabilities.