Most methods of personality scale construction have clear statistical disadvantages. A hybrid method (Darlington and Bishop, 1966) was found to increase scale validity more than any other method, with large item pools. A simple modification of the Darlington-Bishop method (algebraically and conceptually similar to ridge regression, but…

First grade students stratified on the basis of their racial-ethnic and socioeconomic status (SES) were studied to determine factors measured by several readiness (aptitude) tests and to learn whether these factors differed for the children from the various groups. SES was determined by father's occupation, or if absent, mother's occupation; the…