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Longitudinal Analysis provides an accessible, application-oriented treatment of introductory and advanced linear models for within-person fluctuation and change. Organized by research design and data type, the text uses in-depth examples to provide a complete description of the model-building process. The core longitudinal models and their extensions are presented within a multilevel modeling framework, paying careful attention to the modeling concerns that are unique to longitudinal data. Written in a conversational style, the text provides verbal and visual interpretation of model equations to aid in their translation to empirical research results. Overviews and summaries, boldfaced key terms, and review questions will help readers synthesize the key concepts in each chapter.

• A description of the data manipulation steps required prior to model estimation so readers can more easily apply the steps to their own data
• An emphasis on how the terminology, interpretation, and estimation　of familiar general linear models relates to those of more complex models for longitudinal data
• Integrated model comparisons, effect sizes, and statistical inference in each example to strengthen readers’ understanding of the overall model-building process
• Sample results sections for each example to provide useful templates for published reports
• Examples using both real and simulated data in the text, along with syntax and output for SPSS, SAS, STATA, and Mplus　at　www.PilesOfVariance.com　to help readers apply the models　to their own data

The book opens with the building blocks of longitudinal analysis?general ideas, the general linear model for between-person analysis, and between- and within-person models for the variance and the options within repeated measures analysis of variance. Section 2 introduces unconditional longitudinal models including alternative covariance structure models to describe within-person fluctuation over time and random effects models for within-person change. Conditional longitudinal models are presented in section 3, including both time-invariant and time-varying predictors. Section 4 reviews advanced applications, including alternative metrics of time in accelerated longitudinal designs, three-level models for multiple dimensions of within-person time, the analysis of individuals in groups over time, and repeated measures designs not involving time. The book concludes with additional considerations and future directions, including an overview of sample size planning and other model extensions for non-normal outcomes and intensive longitudinal data.

Class-tested at the University of Nebraska-Lincoln and in intensive summer workshops, this is　an ideal text for graduate-level courses on　longitudinal analysis or general multilevel modeling taught in psychology, human development and family studies, education, business, and other behavioral, social, and health sciences. The book’s accessible approach will also help those trying to learn on their own. Only familiarity with general linear models (regression, analysis of variance) is needed for this text.

This class-tested introduction emphasizes the relatedness of the models that builds a strong foundation of the basics to better prepare readers for the more advanced models to come. Organized by research design, the text emphasizes modeling decisions unique to longitudinal or repeated measures data. Examples with sample results sections emphasize the steps involved in reporting the model specification and the decision-making and interpretation processes. The website features the book’s data sets, syntax and sample output for various programs, and exercises. Ideal for advanced students and researchers in the behavioral and social sciences, prerequisites include familiarity with GLM and SEM.

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Section 1: Building Blocks for Longitudinal Analysis  1. Introduction to the Analysis of Longitudinal Data  2. Between-Person Analysis and Interpretation of Interactions  3. Introduction to Within-Person Analysis and Model Comparisons  Section 2: Modeling the Effects of Time  4. Describing Within-Person Fluctuation over Time  5. Introduction to Random Effects of Time and Model Estimation  6. Describing Within-Person Change over Time  Section 3: Modeling the Effects of Predictors  7. Time-Invariant Predictors in Longitudinal Models  8. Time-Varying Predictors in Models of Within-Person Fluctuation  9. Time-Varying Predictors in Models of Within-Person Change Section 4: Advanced Applications  10. Analysis over Alternative Metrics and Multiple Dimensions of Time  11. Analysis of Individuals within Groups over Time  12. Analysis of Repeated Measures Designs Not Involving Time  13. Additional Considerations and Related Models

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