Mental retardation and WAIS-R difference scores.
This article explores the psychometric properties (reliabilities, standard deviations and measurement errors) of Wechsler Adult Intelligence Scale--Revised (Wechsler, 1981) subtest difference scores. The sample consisted of 290 subjects with IQ less than 80. Results demonstrated less than satisfactory difference score reliability and disproportionate measurement error. Nevertheless, neither property was so inadequate as to render cautious profile interpretation impossible. The tabled values can help clinicians working with developmentally delayed clients interpret differences between subtest scores based on statistically reliable discrepancies.
Atkinson
L
L
Surrey Place Centre, Toronto, Ontario, Canada.
D003627:Data Interpretation, Statistical; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology; D007361:Intelligence Tests; D008297:Male; D015203:Reproducibility of Results