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An Assessment of the Dimensionality of Three SAT-Verbal Test Editions

Author

Listed:
  • Linda L. Cook
  • Neil J. Dorans
  • Daniel R. Eignor

Abstract

A strong assumption made by most commonly used item response theory (IRT) models is that the data are unidimensional, that is, statistical dependence among item scores can be explained by a single ability dimension. First-order and second-order factor analyses were conducted on correlation matrices among item parcels of SAT-Verbal items. The item parcels were constructed to yield correlation matrices that were amenable to linear factor analyses. The first-order analyses were employed to assess the effective dimensionality of the item parcel data. Second-order analyses were employed to test meaningful hypotheses about the structure of the data. Parcels were constructed for three SAT-Verbal editions. The dimensionality analyses revealed that one SAT-Verbal test edition was less parallel to the other two editions than these other editions were to each other. Refinements in the dimensionality methodology and a more systematic dimensionality assessment are logical extensions of the present research.

Suggested Citation

  • Linda L. Cook & Neil J. Dorans & Daniel R. Eignor, 1988. "An Assessment of the Dimensionality of Three SAT-Verbal Test Editions," Journal of Educational and Behavioral Statistics, , vol. 13(1), pages 19-43, March.
  • Handle: RePEc:sae:jedbes:v:13:y:1988:i:1:p:19-43
    DOI: 10.3102/10769986013001019
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