The Relative Efficiency of Two Tests as a Function of Ability Level SAT
- Author(s):
- Lord, Frederic M.
- Publication Year:
- 1973
- Report Number:
- RB-73-41
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 14
- Subject/Key Words:
- Error of Measurement, SAT, Test Interpretation, True Scores
Abstract
A new formula is developed for the relative efficiency of two tests measuring the same trait. The formula expresses relative efficiency solely in terms of the standard errors of measurement and surprisingly, the frequency distributions of true scores. Approximate methods for estimating relative efficiency may make this function routinely available. A numerical illustration compares new and old estimates of relative efficiency for subtests from the Scholastic Aptitude Test. (Author) (16pp.)
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- http://dx.doi.org/10.1002/j.2333-8504.1973.tb00652.x