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First published online April 1, 2015

On the Relationship Between Classical Test Theory and Item Response Theory: From One to the Other and Back

Abstract

The frequently neglected and often misunderstood relationship between classical test theory and item response theory is discussed for the unidimensional case with binary measures and no guessing. It is pointed out that popular item response models can be directly obtained from classical test theory-based models by accounting for the discrete nature of the observed items. Two distinct observational equivalence approaches are outlined that render the item response models from corresponding classical test theory-based models, and can each be used to obtain the former from the latter models. Similarly, classical test theory models can be furnished using the reverse application of either of those approaches from corresponding item response models.

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Published In

Article first published online: April 1, 2015
Issue published: April 2016

Keywords

  1. binary item
  2. classical test theory
  3. item response theory
  4. observational equivalence
  5. unidimensionality

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© The Author(s) 2015.
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Authors

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Tenko Raykov
Michigan State University, East Lansing, MI, USA
George A. Marcoulides
University of California, Santa Barbara, CA, USA

Notes

Tenko Raykov, Measurement and Quantitative Methods, Michigan State University, 443A Erickson Hall, East Lansing, MI 48824, USA. Email: [email protected]

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