Evaluating Sources of Collateral Information on Small-Sample Equating
- Author(s):
- Kim, Sooyeon; Livingston, Samuel A.; Lewis, Charles
- Publication Year:
- 2009
- Report Number:
- RR-09-14
- Source:
- ETS Research Report
- Document Type:
- Report
- Page Count:
- 23
- Subject/Key Words:
- Equating, Empirical Bayes Methods, Collateral Information, Sample Size, Stability, Bias
Abstract
The small-sample equating methods were evaluated for agreement with the large-group equating results. The new-form sample size in the small-sample equatings was systematically varied (10, 25, 50, 100, 200) as was the sample size in the equatings used as collateral information (100, 200, all available examinees). The results indicated that the use of collateral information tended to improve the accuracy of the equating when the new-form sample size was 25 or fewer.
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- http://dx.doi.org/10.1002/j.2333-8504.2009.tb02171.x