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Clarifying Problems and Offering Solutions for Correlated Error when Assessing the Validity of Selected-Subtest Short Forms
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Girard, 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