title: Coefficients alpha for components.
abstract: The formula for coefficient alpha for a component is developed. Kaiser's special formula for coefficient alpha for a principal component and the Kaiser-Guttman Rule for the "number of components" are mentioned. A numerical example is added. It is conjectured that the sum of coefficients alpha is invariant under orthogonal rotation.
authors.affiliation: Educational Testing Service, Berkeley, California.
authors.forename: H F
authors.initials: HF
authors.lastname: Kaiser
authors.forename: W T
authors.initials: WT
authors.lastname: Norman
mesh_terms: D006801:Humans; D015233:Models, Statistical; D011581:Psychological Tests / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000379:methods; D012984:Software