Factor structure of the Norwegian version of the WAIS-III in a clinical sample: the arithmetic problem.
Confirmatory Factor Analyses (CFA) of the Wechsler Adult Intelligence Scale-III (WAIS-III) lend partial support to the four-factor model proposed in the test manual. However, the Arithmetic subtest has been especially difficult to allocate to one factor. Using the new Norwegian WAIS-III version, we tested factor models differing in the number of factors and in the placement of the Arithmetic subtest in a mixed clinical sample (n = 272). Only the four-factor solutions had adequate goodness-of-fit values. Allowing Arithmetic to load on both the Verbal Comprehension and Working Memory factors provided a more parsimonious solution compared to considering the subtest only as a measure of Working Memory. Effects of education were particularly high for both the Verbal Comprehension tests and Arithmetic.
Egeland
Jens
J
Department of Research,Vestfold Mental Health Care Trust, Norway. jens.egeland@piv.no
Bosnes
Ole
O
Johansen
Hans
H
D000328:Adult; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D020208:Brain Injury, Chronic / Q000175:diagnosis* / Q000523:psychology; D032882:Comprehension; D003431:Cross-Cultural Comparison; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000175:diagnosis* / Q000523:psychology; D007360:Intelligence; D007802:Language; D007859:Learning Disabilities / Q000175:diagnosis* / Q000523:psychology; D008297:Male; D008433:Mathematics; D008570:Memory, Short-Term; D008875:Middle Aged; D009664:Norway; D011594:Psychometrics / Q000706:statistics & numerical data; D012016:Reference Values; D015203:Reproducibility of Results; D019966:Substance-Related Disorders / Q000175:diagnosis* / Q000523:psychology; D014175:Translating; D014888:Wechsler Scales / Q000706:statistics & numerical data*