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Grimm, Kevin J.; Fine, Kimberly; Stegmann, Gabriela – International Journal of Behavioral Development, 2021
Modeling within-person change over time and between-person differences in change over time is a primary goal in prevention science. When modeling change in an observed score over time with multilevel or structural equation modeling approaches, each observed score counts toward the estimation of model parameters equally. However, observed scores…
Descriptors: Error of Measurement, Weighted Scores, Accuracy, Item Response Theory
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Marcoulides, Katerina M.; Grimm, Kevin J. – Educational and Psychological Measurement, 2017
Synthesizing results from multiple studies is a daunting task during which researchers must tackle a variety of challenges. The task is even more demanding when studying developmental processes longitudinally and when different instruments are used to measure constructs. Data integration methodology is an emerging field that enables researchers to…
Descriptors: Growth Models, Longitudinal Studies, Mathematics Skills, Achievement Tests
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Liu, Haiyan; Zhang, Zhiyong; Grimm, Kevin J. – Grantee Submission, 2016
Growth curve modeling provides a general framework for analyzing longitudinal data from social, behavioral, and educational sciences. Bayesian methods have been used to estimate growth curve models, in which priors need to be specified for unknown parameters. For the covariance parameter matrix, the inverse Wishart prior is most commonly used due…
Descriptors: Bayesian Statistics, Computation, Statistical Analysis, Growth Models