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Teacher’s Corner: Toward a Coherent View of Reliability in Test Theory

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  • Heng Li
  • Howard Wainer

Abstract

Reliability of test scores, as estimated through measures of internal consistency, has been characterized mathematically in many ways that appear, on the surface at least, to be very dissimilar to one another. In this essay we provide a general mathematical framework that specializes to four different reliability coefficients. Through consideration of this general framework it becomes easier to convey to students both the individual character of the different formulations of reliability and the extent of their underlying similarity. In addition to providing a coherent view of reliability, the unified formula is also found to be a convenient vehicle for introducing more specialized topics, such as the Kaiser-Guttman rule.

Suggested Citation

  • Heng Li & Howard Wainer, 1997. "Teacher’s Corner: Toward a Coherent View of Reliability in Test Theory," Journal of Educational and Behavioral Statistics, , vol. 22(4), pages 478-484, December.
    • Handle: RePEc:sae:jedbes:v:22:y:1997:i:4:p:478-484
    DOI: 10.3102/10769986022004478
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