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Polytomous DIF

Polytomous differential item functioning detects whether a test or survey item with more than two ordered response categories (e.g., Likert-type scales, partial-credit items) functions differently across groups such as gender, ethnicity, or language background, after controlling for the latent trait being measured. It extends classical binary DIF methods to ordinal response formats.

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Polytomous Differential Item Functioning

Taksonoomiline meetodikirje · latent-structure / psychometrics

Zumbo, B. D. (1999). A handbook on the theory and methods of differential item functioning (DIF): Logistic regression modeling as a unitary framework for binary and Likert-type (ordinal) item scores. Directorate of Human Resources Research and Evaluation, Department of National Defense. · URL
Osterlind, S. J. & Everson, H. T. (2009). Differential Item Functioning (2nd ed.). SAGE Publications. · ISBN 978-1412954945

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