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  The Consistency of Student Proficiency Classifications Under Competing IRT Models
 
 
Titel: The Consistency of Student Proficiency Classifications Under Competing IRT Models
Auteur: Stone, Clement A.
Weissman, Alexander
Lane, Suzanne
Verschenen in: Educational assessment
Paginering: Jaargang 10 (2005) nr. 2 pagina's 125-146
Jaar: 2005-05-01
Inhoud: States are implementing statewide assessment programs that classify students into proficiency levels that reflect state-defined performance standards. In an effort to provide support for score interpretations, this study examined the consistency of classifications based on competing item response theory (IRT) models for data from a state assessment program. Classification of students into proficiency levels was compared based on a 1-parameter vs. a 3-parameter IRT model. Despite an overall high level of agreement between classifications based on the 2 models, systematic differences were observed. Under the 1-parameter model, proficiency was underestimated for low proficiency classifications but overestimated for upper proficiency classifications. This resulted in higher "Below Basic" and "Advanced" classifications under 1-parameter vs. 3-parameter IRT applications. Implications of these differences are discussed.
Uitgever: Routledge
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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