Power analysis of longitudinal studies with piecewise linear growth and attrition

• Published in: Behavior research methods Vol. 54; no. 6; pp. 2939 - 2948
• Main Author: Moerbeek, Mirjam
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2022; Springer Nature B.V
• Subjects: Behavioral Science and Psychology; Cognitive Psychology; Growth models; Growth rate; Humans; Longitudinal Studies; Psychology; Schools; Piecewise growth model; Multiphase; Shiny app; Power; Multilevel model

In longitudinal research, the development of some outcome variable(s) over time (or age) is studied. Such relations are not necessarily smooth, and piecewise growth models may be used to account for differential growth rates before and after a turning point in time. Such models have been well develo...