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Assessment
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Factor Structure of the Norwegian Version of the WAIS-III in a Clinical Sample

The Arithmetic Problem

Jens Egeland

Vestfold Mental Health Care Trust, Norway, jens.egeland{at}piv.no

Ole Bosnes

Namsos Hospital, Norway

Hans Johansen

The Hospital of Rehabilitation, Stavern, Norway

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.

Key Words: WAIS-III • factor structure • intelligence • arithmetic

This version was published on September 1, 2009

Assessment, Vol. 16, No. 3, 292-300 (2009)
DOI: 10.1177/1073191108324464
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