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  • Title: Factor structure of the Norwegian version of the WAIS-III in a clinical sample: the arithmetic problem.
    Author: Egeland J, Bosnes O, Johansen H.
    Journal: Assessment; 2009 Sep; 16(3):292-300. PubMed ID: 18838579.
    Abstract:
    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.
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