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ERIC Number: EJ829928
Record Type: Journal
Publication Date: 2009
Pages: 15
Abstractor: As Provided
Reference Count: 15
ISSN: ISSN-0146-6216
A Modified Frequency Estimation Equating Method for the Common-Item Nonequivalent Groups Design
Wang, Tianyou; Brennan, Robert L.
Applied Psychological Measurement, v33 n2 p118-132 2009
Frequency estimation, also called poststratification, is an equating method used under the common-item nonequivalent groups design. A modified frequency estimation method is proposed here, based on altering one of the traditional assumptions in frequency estimation in order to correct for equating bias. A simulation study was carried out to compare equating errors for the modified frequency estimation method, the traditional frequency estimation method, and the chained equipercentile method. The results show that the modified frequency estimation method performs better than the traditional frequency estimation method and, under most circumstances, also performs better than the chained equipercentile method. (Contains 5 tables, 4 figures and 1 note.)
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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