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ERIC Number: EJ1111323
Record Type: Journal
Publication Date: 2005-Dec
Pages: 27
Abstractor: As Provided
ISBN: N/A
ISSN: EISSN-2330-8516
EISSN: N/A
Identifiability of Parameters in Item Response Models with Unconstrained Ability Distributions. Research Report. ETS RR-05-24
Haberman, Shelby J.
ETS Research Report Series, Dec 2005
If a parametric model for the ability distribution is not assumed, then the customary two-parameter and three-parameter logistic models for item response analysis present identifiability problems not encountered with the Rasch model. These problems impose substantial restrictions on possible models for ability distributions.
Descriptors: Item Response Theory, Ability, Models, Maximum Likelihood Statistics
Educational Testing Service. Rosedale Road, MS19-R Princeton, NJ 08541. Tel: 609-921-9000; Fax: 609-734-5410; e-mail: RDweb@ets.org; Web site: https://www.ets.org/research/policy_research_reports/ets
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