Journal
APPLIED PSYCHOLOGICAL MEASUREMENT
Volume 35, Issue 8, Pages 583-603Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0146621611428446
Keywords
differential item functioning; dimensionality; item response model; latent class model
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The models used in this article are secondary dimension mixture models with the potential to explain differential item functioning (DIF) between latent classes, called latent DIF. The focus is on models with a secondary dimension that is at the same time specific to the DIF latent class and linked to an item property. A description of the models is provided along with a means of estimating model parameters using easily available software and a description of how the models behave in two applications. One application concerns a test that is sensitive to speededness and the other is based on an arithmetic operations test where the division items show latent DIF.
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