title: A note on alternative parameterizations of a model for evaluating agreement between two tests.
abstract: The agreement between two competing tests which purport to measure the same trait is a common concern in test development. In this paper three alternative parameterizations of the measurement model useful in this context are presented. Both one-factor and two-factor approaches are applied. Lord's classic example, where the main problem is to investigate whether time limits represent an extra speed component in a vocabulary test, is used to illustrate the ideas.
authors.affiliation: Department of Health and Functional Capacity, National Public Health Institute,Turku, Finland. erkki.alanan@ktl.fi
authors.forename: Erkki
authors.initials: E
authors.lastname: Alanen
authors.forename: Esko
authors.initials: E
authors.lastname: Leskinen
mesh_terms: D006801:Humans; D008962:Models, Theoretical; D011594:Psychometrics / Q000706:statistics & numerical data*; D015203:Reproducibility of Results