title: The impact of methodological changes in gerontology.
abstract: The impact of methodological changes on gerontology is illustrated by discussing the example of the age-cohort-period problem as an innovation in research design, and examining the case of confirmatory factor analysis as an illustration of how methodological innovation informs theory.
authors.affiliation: Dept. of Human Development and Family Studies, Penn State University, University Park 16802.
authors.forename: K W
authors.initials: KW
authors.lastname: Schaie
mesh_terms: D000368:Aged; D000375:Aging / Q000523:psychology*; D015331:Cohort Studies; D005853:Geriatrics / Q000379:methods*; D006801:Humans; D015233:Models, Statistical; D012107:Research Design / Q000639:trends