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ERIC Number: ED463333
Record Type: Non-Journal
Publication Date: 2002-Apr
Pages: 27
Abstractor: N/A
Reference Count: N/A
A Comparison of IRT Equating and Beta 4 Equating.
Kim, Dong-In; Brennan, Robert; Kolen, Michael
Four equating methods were compared using four equating criteria: first-order equity (FOE), second-order equity (SOE), conditional mean squared error (CMSE) difference, and the equipercentile equating property. The four methods were: (1) three parameter logistic (3PL) model true score equating; (2) 3PL observed score equating; (3) beta 4 true score equating; and (4) beta 4 observed score equating. Four subtests of the Iowa Tests of Basic Skills, with two forms of each test and a random sample of 3,000 examinees for each form were used. Results show that true score equating more closely achieved FOE than observed score equating, while observed score equating more closely achieved SOE, CMSE difference, and equipercentile equating property than true score equating. Among the four equating methods, 3PL observed most closely achieved SOE and had the smallest CMSE difference, and beta 4 observed was the method that most closely met the equipercentile equating property. (Contains 6 tables, 7 figures, and 26 references.) (SLD)
Publication Type: Numerical/Quantitative Data; Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Iowa Tests of Basic Skills