Tests of the Same Length Do Have the Same Standard Error of Measurement
- Author(s):
- Lord, Frederic M.
- Publication Year:
- 1958
- Report Number:
- RB-58-07
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 15
- Subject/Key Words:
- Office of Naval Research, Error of Measurement, Test Length, Test Reliability
Abstract
For 50 tests whose mean scores were between 35 and 65 percent of the maximum possible score, the standard error of measurement, computed from actual data by a conventional formula, is found to correlate .996 with the square root of the number of items in the test.
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- http://dx.doi.org/10.1002/j.2333-8504.1958.tb00082.x