The Consequences of Ignoring Variability in Measurement Occasions Within Data Collection Waves in Latent Growth Models
Makaleler > Tam Makale · 2014
Yazarlar: Burak AYDIN, Walter L. Leite, James Algina
MULTIVARIATE BEHAVIORAL RESEARCH, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 2014, cilt 49, ss 149-160
DOI: 10.1080/00273171.2014.887901
Özet
In longitudinal data collection, it is common that each wave of collection spans several months. However, researchers using latent growth models commonly ignore variability in data collection occasions within a wave. In this study, we investigated the consequences of ignoring within-wave variability in measurement occasions using a Monte Carlo simulation and an empirical study. The results of the simulation study showed that ignoring heterogeneity resulted in biased estimates for some parameters, especially when heterogeneity was large and assessment dates had a skewed distribution. Models constructed on person-specific time points yielded precise estimates and more adequate model fit. In the empirical study, we demonstrated different time coding strategies with a subsample taken from Early Childhood Longitudinal Study Kindergarten Cohort.