This chapter summarizes several methodological issues, including certain research design and analysis paradigms, related to the Seattle Longitudinal Study. The discussion begins with a brief exposition of the relationship between cross-sectional and longitudinal data within the context of the general developmental model, followed by a presentation of the rationale for a variety of simple and sequential schemes for data acquisition and analysis. The problems of internal validity of developmental studies and designs for the measurement and control that plague developmental studies are explored. The chapter ends by exploring the relationship between observed measures and latent (unobserved) variables, and how confirmatory (restricted) factor analysis can be applied to assess construct equivalence across cohorts, age, and time in the study of developmental problems.
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