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Magis, David; Raiche, Gilles; Beland, Sebastien; Gerard, Paul – International Journal of Testing, 2011
We present an extension of the logistic regression procedure to identify dichotomous differential item functioning (DIF) in the presence of more than two groups of respondents. Starting from the usual framework of a single focal group, we propose a general approach to estimate the item response functions in each group and to test for the presence…
Descriptors: Language Skills, Identification, Foreign Countries, Evaluation Methods