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ERIC Number: EJ1109932
Record Type: Journal
Publication Date: 2013-Mar
Pages: 23
Abstractor: As Provided
ISSN: EISSN-2330-8516
Choice of Target Population Weights in Rater Comparability Scoring and Equating. Research Report. ETS RR-13-03
Puhan, Gautam
ETS Research Report Series, Mar 2013
The purpose of this study was to demonstrate that the choice of sample weights when defining the target population under poststratification equating can be a critical factor in determining the accuracy of the equating results under a unique equating scenario, known as "rater comparability scoring and equating." The nature of data collection under "rater comparability scoring" is such that it results in a very high correlation between the anchor and total score in the new form but only a moderate correlation in the reference form. I demonstrated, using data collected under a "rater comparability scoring" situation, that this difference in the anchor-total correlation in the new and reference forms can have a predictable impact on the equating results based on different sample weights (i.e., the equating results are most accurate when the reference form sample is defined as the target population, least accurate when the new form sample is defined as the target population, and somewhere in the middle when the new and reference form samples are equally weighed when defining the target population).
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A