A Framework for Investigating Change over Time

Judith D. Singer and John B. Willett

in Applied Longitudinal Data Analysis

Published in print May 2003 | ISBN: 9780195152968
Published online September 2009 | e-ISBN: 9780199864980 | DOI:
A Framework for Investigating Change over Time

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This chapter describes why longitudinal data are necessary for studying change. Section 1.1 introduces three longitudinal studies of change. Section 1.2 distinguishes between the two types of issues these examples address: within-individual change, how does each person change over time? Interindividual differences in change, what predicts differences among people in their changes? This distinction provides an appealing heuristic for framing research questions and underpins the statistical models we ultimately present. Section 1.3 identifies three requisite methodological features of any study of change: the availability of multiple waves of data; a substantively meaningful metric for time; and an outcome that changes systematically.

Keywords: change; longitudinal data; longitudinal studies; interindividual differences

Chapter.  5052 words. 

Subjects: Public Health and Epidemiology

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