Note on "Tests of the Same Length Do Have the Same Standard Error of Measurement"
- Author(s):
- Swineford, Frances
- Publication Year:
- 1958
- Report Number:
- RB-58-08
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 15
- Subject/Key Words:
- Error of Measurement, Lord, Frederic Mather, Test Length, Test Reliability
Abstract
Lord has reported a high relation between the K-R (20) standard error of measurement and test length. The present inquiry leads to an expression of this relation in terms of item variances and covariances and indicates the ranges of these values normally found for ETS tests.
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- http://dx.doi.org/10.1002/j.2333-8504.1958.tb00083.x