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Developmental Influences on Adult IntelligenceThe Seattle longitudinal study$
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K. Warner Schaie

Print publication date: 2005

Print ISBN-13: 9780195156737

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195156737.001.0001

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Methodological Issues

Methodological Issues

(p.20) chapter two Methodological Issues
Developmental Influences on Adult Intelligence

K. Warner Schaie

Oxford University Press

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.

Keywords:   research methodology, Seattle Longitudinal Study, intellectual development, adults, cross-sectional data, longitudinal data, developmental studies, construct equivalence

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