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ERIC Number: ED441842
Record Type: Non-Journal
Publication Date: 2000-Apr
Pages: 30
Abstractor: N/A
Reference Count: N/A
The Effects of Content Homogeneity and Equating Method on the Accuracy of Common-Item Test Equating.
Yang, Wen-Ling
This study investigated whether equating accuracy improves with an anchor test that is more representative of its corresponding total test and whether such content effect depends on the particular equating method used. Scoring outcomes of a professional examination for a medical specialty were used. A total of 1,092 examinees took one form, and 1,149 took the other form. Item-sampling schemes were introduced to manipulate the content homogeneity and representation of anchor items so that their effects on equating accuracy could be studied with varied equating methods. Multiple criteria were proposed to evaluate equating accuracy. Overall, the study found that all the equating methods employed had accurate results to a moderate degree. They all produced more accurate results when the anchor items were more representative of their total test or when the content coverage of a test concentrated on fewer topics. In general, Item Response Theory-based equating was found to be more accurate than classical equating, but the small differences may not be substantial. To produce equating outcomes that are precise and less prone to bias, various equating methods should be considered for equating test forms for high-stakes examinations. (Contains 4 tables, 3 figures, and 22 references.) (SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A