The Utilization of Unreliable Difference Scores
- Author(s):
- Lord, Frederic M.
- Publication Year:
- 1958
- Report Number:
- RB-58-01
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 8
- Subject/Key Words:
- Comparative Testing, Difference Scores, Scores, Test Reliability
Abstract
The difference between two test scores may be quite useful even when this difference has very low reliability by conventional standards. One method for using such difference scores is examined in detail: the proportion of correct judgments that will be made about individual students is determined as a function of the reliability coefficient of the difference.
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- http://dx.doi.org/10.1002/j.2333-8504.1958.tb00077.x