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Assessment, Vol. 15, No. 2, 132-144 (2008)
DOI: 10.1177/1073191107309345

Equivalence of a Measurement Model of Cognitive Abilities in U.S. Standardization and Australian Neuroscience Samples

Stephen C. Bowden

University of Melbourne, St. Vincent's Hospital Melbourne, sbowden{at}unimelb.edu.au

Lawrence G. Weiss

The Psychological Corporation

James A. Holdnack

The Psychological Corporation

Fiona J. Bardenhagen

St. Vincent's Hospital Melbourne

Mark J. Cook

St. Vincent's Hospital Melbourne

A psychological measurement model provides an explicit definition of (a) the theoretical and (b) the numerical relationships between observed scores and the latent variables that underlie the observed scores. Examination of the metric invariance of a measurement model involves testing the hypothesis that all components of the model relating observed scores to latent variables are equal across groups. The assumption of metric invariance is necessary for simple interpretation of scores. Establishing metric invariance also has implications for interpretation of convergent and divergent validity and patterns of deficit or disability. In this study the equivalence of the measurement model derived from the U.S. Wechsler Adult Intelligence Scale–III standardization sample was compared with a heterogeneous neurosciences sample in Australia. A pattern of strict metric invariance was observed across samples. These results provide evidence of the generality of the model underlying measurement of cognitive abilities.

Key Words: measurement invariance • intelligence • confirmatory factor analysis • Wechsler Intelligence Scale–III • neuropsychological assessment • neuropsychological diagnosis • construct validity


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