DIF Assessment for Polytomously Scored Items: A Framework for Classification and Evaluation
Open Access
- 1 March 1995
- journal article
- research article
- Published by SAGE Publications in Applied Psychological Measurement
- Vol. 19 (1), 23-37
- https://doi.org/10.1177/014662169501900104
Abstract
Increased use of alternatives to the traditional dichotomously scored multiple-choice item yield complex responses that require complex scoring rules. Some of these new item types can be polytomously scored. DIF methodology is well-defined for traditional dichotomously scored multiple-choice items. This paper provides a classification scheme of DIF procedures for dichotomously scored items that is applicable to new DIF procedures for polytomously scored items. In the process, a formal development of a polytomous version of a dichotomous DIF technique is presented. Several polytomous DIF techniques are evaluated in terms of statistical and practical criteria. Index terms: DIF methodology, differential item functioning, item bias, polytomous scoring, statistical criteria for differential item functioningKeywords
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