Measurement invariance in the assessment of people with an intellectual disability

Article English OPEN
MacLean, Hannah ; McKenzie, Karen ; Kidd, Gill ; Murray, Aja Louise ; Schwannauer, Matthias (2011)

Intellectual assessment is central to the process of diagnosing an intellectual disability and the assessment process needs to be valid and reliable. One fundamental aspect of validity is that of measurement invariance, i.e. that the assessment measures the same thing in different populations. There are reasons to believe that measurement invariance of the Wechsler scales may not hold for people with an intellectual disability. Many of the issues which may influence factorial invariance are common to all versions of the scales. The present study, therefore, explored the factorial validity of the WAIS-III as used with people with an intellectual disability. Confirmatory factor analysis was used to assess goodness of fit of the proposed four factor model using 13 and 11 subtests. None of the indices used suggested a good fit for the model, indicating a lack of factorial validity and suggesting a lack of measurement invariance of the assessment with people with an intellectual disability. Several explanations for this and implications for other intellectual assessments were discussed.
  • References (6)

    Jensen, A. R. (2003). Regularities in Spearman's law of diminishing returns. doi: DOI: 10.1016/S0160-2896(01)00094-0. Intelligence, 31(2), 95-105.

    Jones, J, Schaik, P. van. & Witts, P. (2006). The factor structure of the WAIS-III in persons with low IQ. British Journal of Clinical Psychology, 45 (2), 145-152.

    Kaufman, A.S. & Lichtenberger, E.O. (1999). Essentials of WAIS III Assessment. New York: John Wiley & Sons.

    Kaufman, A.S. (2000). Two and three factor solutions of the WAIS-III. Assessment, 8(3), 267-280.

    Kline, P. (2000). A Psychometrics Primer. London: Free Association Books.

    Lawley, D.N. & Maxwell, A.E. (1971). Factor analysis as a statistical method. London: Butterworth and Co.

  • Metrics
    No metrics available
Share - Bookmark