Abstract
The PARELLA model is a probabilistic parallelogram model that can be used for the measurement of latent attitudes or latent preferences. The data analyzed are the dichotomous responses of persons to items, with a one (zero) indicating agreement (disagreement) with the content of the item. The model provides a unidimensional representation of persons and items. The response probabilities are a function of the distance between person and item: the smaller the distance, the larger the probability that a person will agree with the content of the item. This paper discusses how the approach to differential item functioning presented by Thissen, Steinberg, and Wainer can be implemented for the PARELLA model.
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Requests for the PARELLA software should be sent to Iec Progamma PO Box 841, 9700 AV Groningen, The Netherlands.
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Hoijtink, H., Molenaar, I.W. Testing for DIF in a model with single peaked item characteristic curves: The parella model. Psychometrika 57, 383–397 (1992). https://doi.org/10.1007/BF02295426
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DOI: https://doi.org/10.1007/BF02295426