title: Nonlinear growth curves in developmental research.
abstract: Developmentalists are often interested in understanding change processes, and growth models are the most common analytic tool for examining such processes. Nonlinear growth curves are especially valuable to developmentalists because the defining characteristics of the growth process such as initial levels, rates of change during growth spurts, and asymptotic levels can be estimated. A variety of growth models are described beginning with the linear growth model and moving to nonlinear models of varying complexity. A detailed discussion of nonlinear models is provided, highlighting the added insights into complex developmental processes associated with their use. A collection of growth models are fit to repeated measures of height from participants of the Berkeley Growth and Guidance Studies from early childhood through adulthood.
authors.affiliation: Department of Psychology, University of California, Davis, CA 95616, USA. kjgrimm@ucdavis.edu
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Grimm
authors.forename: Nilam
authors.initials: N
authors.lastname: Ram
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Hamagami
mesh_terms: D000293:Adolescent; D001827:Body Height; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D005260:Female; D057238:Growth Charts; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D012106:Research; D012737:Sex Factors; D055815:Young Adult