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Addressing Score Bias and Differential Item Functioning Due to Individual Differences in Response Style

¹ University of Wisconsin, Madison
² University of Idaho

^* To whom correspondence should be addressed. E-mail: dmbolt{at}wisc.edu.

	Abstract

A multidimensional item response theory model that accounts for response style factors is presented. The model, a multidimensional extension of Bock’s nominal response model, is shown to allow for the study and control of response style effects in ordered rating scale data so as to reduce bias in measurement of the intended trait. In the current application, the model is also used to investigate response style as an underlying cause of differential item functioning. The approach is illustrated using the item responses of cigarette smokers to the Wisconsin Inventory of Smoking Dependence Motives, a self-report measure of tobacco dependence.

First published on April 15, 2009, doi:10.1177/0146621608329891

Applied Psychological Measurement 2009;33:335.

A more recent version of this article appeared on July 1, 2009


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