Estimating Total Test Reliability from Parts of Unequal Length
- Author(s):
- Horst, Paul
- Publication Year:
- 1950
- Report Number:
- RB-50-34
- Source:
- ETS Research Bulletin
- Document Type:
- Report
- Page Count:
- 6
- Subject/Key Words:
- Reliability Formulas, Test Length, Test Reliability
Abstract
The Spearman-Brown split-half formula has been used for estimating a test's reliability from the correlation between its two comparable halves. However, it may be easier to get part scores from parts that are unequal in length and it is still possible to estimate the reliability of the total test correlation between the two parts if we know what proportion of the whole test is taken up by each part. Many mathematical formulas are provided. (SGK).
Read More
- Request Copy (specify title and report number, if any)
- http://dx.doi.org/10.1002/j.2333-8504.1950.tb00474.x