Abstract
This paper shows practical guidelines of sample size requirements when results of longitudinal study are to be analyzed by using latent growth models (LGM). The latent growth models are much popularized in recent years and very worth investigated. Latent growth model was derived from theories of the structural equation models (SEM). We use the method proposed by Satorra and Saris (1985) who originated the method to test SEM models and investigate relationships between parameter testing accuracy and statistical power of SEM models. The parameters of latent growth model under investigation are the parameters for modeling linear latent growth rates. We summarize the guidelines in several tables.
| Keywords: | latent growth model; sample size requirements; longitudinal study; statistical power; structural equation model |
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