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ERIC Number: EJ965450
Record Type: Journal
Publication Date: 2012-Apr
Pages: 18
Abstractor: As Provided
Reference Count: 23
ISSN: ISSN-1076-9986
Item-Weighted Likelihood Method for Ability Estimation in Tests Composed of Both Dichotomous and Polytomous Items
Tao, Jian; Shi, Ning-Zhong; Chang, Hua-Hua
Journal of Educational and Behavioral Statistics, v37 n2 p298-315 Apr 2012
For mixed-type tests composed of both dichotomous and polytomous items, polytomous items often yield more information than dichotomous ones. To reflect the difference between the two types of items, polytomous items are usually pre-assigned with larger weights. We propose an item-weighted likelihood method to better assess examinees' ability levels. Simulation results show that the estimated ability based on the new procedure is more consistent with examinee's true ability than the usual maximum likelihood method. (Contains 1 table and 4 figures.)
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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