ERIC Number: EJ922105
Record Type: Journal
Publication Date: 2006-Jun
Abstractor: As Provided
Reference Count: 18
Nonparametric Estimation of Item and Respondent Locations from Unfolding-Type Items
Johnson, Matthew S.
Psychometrika, v71 n2 p257-279 Jun 2006
Unlike their monotone counterparts, nonparametric unfolding response models, which assume the item response function is unimodal, have seen little attention in the psychometric literature. This paper studies the nonparametric behavior of unfolding models by building on the work of Post (1992). The paper provides rigorous justification for a class of nonparametric estimators of respondents' latent attitudes by proving that the estimators consistently rank order the respondents. The paper also suggests an algorithm for the rank ordering of items along the attitudes scale. Finally, the methods are evaluated using simulated data.
Descriptors: Psychometrics, Nonparametric Statistics, Item Response Theory, Models, Feedback (Response), Evaluation Methods, Simulation, Computation, Mathematics
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Publication Type: Journal Articles; Reports - Evaluative
Education Level: N/A
Authoring Institution: N/A