New Perspectives and Applications

Authored by: Remo Ostini , Michael L. Nering

Handbook of Polytomous Item Response Theory Models

Print publication date:  April  2010
Online publication date:  January  2011

Print ISBN: 9780805859928
eBook ISBN: 9780203861264
Adobe ISBN: 9781135168728

10.4324/9780203861264.ch1

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Abstract

Polytomous item response theory (IRT) models are mathematical models used to help us understand the interaction between examinees and test questions where the test questions have various response categories. These test questions are not scored in a simple dichotomous manner (i.e., correct/incorrect); rather, they are scored in way that reflects the particular score category that an examinee has achieved, been classified into, or selected (e.g., a score point of 2 on an item that is scored from 0 to 4, or selecting “somewhat agree” on a survey).

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