Among IRT models, the two-parameter logistic model provided a good fit for dichotomous subtests, while the graded response model fitted the polytomous data. Results: Factor analysis indicated the unidimensionality of each subtest. In addition, factor analysis was performed to investigate the dimensionality of each subtest. The item-level and subtest statistical properties of the Egyptian WAIS-IV were established using a combination of four dichotomous IRT models and four polytomous IRT models. Methods: The sample consisted of 250 adults from Egypt. This study investigates item and scale properties of the Egyptian WAIS-IV using item response theory (IRT) models. Background: The Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) has been adapted to 28 different cultures and there has been considerable interest in examining its structure through exploratory and confirmatory factor analysis.
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