Choice of Anchor Test in Equating CE NEAT PE
- Author(s):
- Sinharay, Sandip; Holland, Paul W.
- Publication Year:
- 2006
- Report Number:
- RR-06-35
- Source:
- ETS Research Report
- Document Type:
- Report
- Page Count:
- 43
- Subject/Key Words:
- Chain Equating (CE), Non-Equivalent-Groups Anchor Test (NEAT) Design, Poststratification Equating (PE), Anchor Test Study, Chain Equipercentile Equating
Abstract
Anchor tests with a spread of item difficulties less than that of a total test seem to perform as well as a minitest with respect to equating bias and equating standard error. Hence, the results demonstrate that requiring an anchor test to mimic the statistical characteristics of the total test may be too restrictive and need not be optimal. As a side benefit, this paper also provides a comparison of the equating performance of post-stratification equating and chain equipercentile equating.
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- http://dx.doi.org/10.1002/j.2333-8504.2006.tb02040.x