title: A structural factor analysis of vocabulary knowledge and relations to age.
abstract: Vocabulary knowledge may not be a unidimensional construct, and the relations between vocabulary knowledge and age may depend on the aspect of vocabulary knowledge being assessed. In this study, we examined the factor structure of a vocabulary test given to a large nationally representative sample of individuals (N approximately 20,500). Results indicated that the vocabulary test is not unidimensional but bidimensional, with Basic Vocabulary and Advanced Vocabulary factors. An analysis of age differences indicates that basic vocabulary is highest around the age of 30, with a negative relation to age in late adulthood; in contrast, advanced vocabulary is unrelated to age between ages 35 and 70. Cohort effects may explain some of the differential age trend.
authors.affiliation: Department of Psychology, University of Virginia, PO Box 400400, Charlottesville, VA 22904-4400, USA. rpbowles@virginia.edu
authors.forename: Ryan P
authors.initials: RP
authors.lastname: Bowles
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Grimm
authors.forename: John J
authors.initials: JJ
authors.lastname: McArdle
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D003430:Cross-Sectional Studies; D005163:Factor Analysis, Statistical; D006801:Humans; D007807:Language Tests; D008875:Middle Aged; D014481:United States; D014825:Vocabulary