An Index of the Discriminating Power of a Test at Different Parts of the Score Range
- Author(s):
- Levine, Richard S.; Lord, Frederic M.
- Publication Year:
- 1958
- Report Number:
- RB-58-13
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 10
- Subject/Key Words:
- Discrimination Index, Scores, Statistical Distributions, Test Reliability, Test Theory, Test Validity
Abstract
An important characteristic of any test is its ability to discriminate among examinees who differ in ability. The conventional reliability and validity coefficients are indices of discrimination for the test as a whole; however, except under certain limited conditions, these over-all indices do not apply at all points along the score scale. The purpose of the present paper is to provide such an index and illustrate its use.
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- http://dx.doi.org/10.1002/j.2333-8504.1958.tb00936.x