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A Comparison between the Piecewise Latent Growth Model and the Parallel-Process Piecewise Latent Growth Model
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Description: Piecewise latent growth models (PWLGMs) can be used to study changes in growth trajectory of an outcome due to an event or condition, such as exposure to treatment. When there are multiple outcomes of interest, a researcher may choose to fit a series of PWLGMs or a single parallel-process PWLGM. An illustrative example is provided using reading and mathematics data from the Early Childhood Longitudinal Study, Kindergarten Class of 2010-11 (ECLS-K:2011). A Monte Carlo simulation study is used to compare the two models. Conditions manipulated included sample size, location of the transition point, the number of time points, and covariate effect size. The results showed no difference between fitting multiple PWLGMs and a single parallel-process PWLGM in terms of power, coverage and Type I error rates.
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