Combining two or more predictor scores into a single score is a recurring task of the personnel psychologist. Questions concerning the number of predictors that can profitably be used and the particular weights to be assigned to them underlie this activity. Basic to both of these questions is the matter of precision of prediction and the economy of the practitioner's time.The standard method for selecting predictors to be included in a battery has been the Wherry-Doolittle Test Selection Technique; once predictors have been selected they are commonly assigned "b" weights through the solution of normal equations. In recent years, several other selection methods have been pro-
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