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Direct linkLiu, Hui; Powers, Daniel A. – Structural Equation Modeling: A Multidisciplinary Journal, 2007
This article applies growth curve models to longitudinal count data characterized by an excess of zero counts. We discuss a zero-inflated Poisson regression model for longitudinal data in which the impact of covariates on the initial counts and the rate of change in counts over time is the focus of inference. Basic growth curve models using a…
Descriptors: Smoking, Structural Equation Models, Longitudinal Studies, Regression (Statistics)
