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Direct linkGirard, Todd A.; Christensen, Bruce K. – Psychological Assessment, 2008
The correlation between a short-form (SF) test and its full-scale (FS) counterpart is a mainstay in the evaluation of SF validity. However, in correcting for overlapping error variance in this measure, investigators have overattenuated the validity coefficient through an intuitive misapplication of P. Levy's (1967) formula. The authors of the…
Descriptors: Error of Measurement, Computation, Psychiatric Services, Correlation
Huttenlocher, Janellen; Hedges, Larry V.; Lourenco, Stella F.; Crawford, L. Elizabeth; Corrigan, Bryce – Journal of Experimental Psychology: General, 2007
In this article, the authors present and test a formal model that holds that people use information about category boundaries in estimating inexactly represented stimuli. Boundaries restrict stimuli that are category members to fall within a particular range. This model posits that people increase the average accuracy of stimulus estimates by…
Descriptors: Stimuli, Classification, Least Squares Statistics, Psychometrics
