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Psychometrika

, Volume 31, Issue 1, pp 93–96 | Cite as

Corrected item-test correlations

  • E. E. Cureton
Article

Abstract

Previous papers on this subject derive the correlation between an item and the remainder of the test. This correlation is unsatisfactory because the reliability of the remainder varies inversely with the reliability of the item omitted. The present paper derives the correlation between an item and the total test, with that item replaced by a rationally equivalent item. The general formula is then modified, for dichotomus items, to give the corrected point-biserial, biserial, and Brogden biserial correlations. The results apply strictly only to factorially homogeneous tests: those in which the same trait or combination of traits is measured (apart from error) by every item.

Keywords

Public Policy Statistical Theory General Formula Homogeneous Test Total Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    Brogden, H. E. A new coefficient: application to biserial correlation and to estimation of selective efficiency.Psychometrika, 1949,14, 169–182.Google Scholar
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    Guilford, J. P. The correlation of an item with a composite of the remaining items in a test.Educ. and psychol. Measmt, 1953,13, 87–93.Google Scholar
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    Henrysson, S. Correction of item-total correlations in item analysis.Psychometrika, 1963,28, 211–218.Google Scholar
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    Zubin, J. The method of internal consistency for selecting test items.J. educ. Psychol., 1934,25, 345–356.Google Scholar

Copyright information

© Psychometric Society 1966

Authors and Affiliations

  • E. E. Cureton
    • 1
  1. 1.University of TennesseeUSA

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