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For every IRT model, a mathematical function is used to specify the probability of item responses as a function of the ability (latent trait). The degree to which the observed data fit the mathematical function needs to be examined since valid results can only be drawn if the data fit the model.
Margaret Wu, Hak Ping Tam, Tsung-Hau Jen
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For every IRT model, a mathematical function is used to specify the probability of item responses as a function of the ability (latent trait). The degree to which the observed data fit the mathematical function needs to be examined since valid results can only be drawn if the data fit the model.
Margaret Wu, Hak Ping Tam, Tsung-Hau Jen
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Differential item functioning and health assessment
Quality of Life Research, 2007Establishing measurement equivalence is important because inaccurate assessment may lead to incorrect estimates of effects in research, and to suboptimal decisions at the individual, clinical level. Examination of differential item functioning (DIF) is a method for studying measurement equivalence.
Jeanne A, Teresi, John A, Fleishman
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Differential Item Functioning in rehabilitation research
Work, 2010Measurement is critical to Rehabilitation practice and research. To provide effective services and to have valid research results, it is imperative to have valid and reliable assessment tools. Differential Item Functioning (DIF) is a statistical procedure which better enables us to assess both the validity and the results of measurement instruments. As
Dent, Gitchel +2 more
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Differential Item Functioning Analysis Using Rasch Item Information Functions
International Journal of Testing, 2009Differential item functioning (DIF) analysis is a statistical technique used for ensuring the equity and fairness of educational assessments. This study formulates a new DIF analysis method using the information similarity index (ISI). ISI compares item information functions when data fits the Rasch model.
Adam E. Wyse, Raymond Mapuranga
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A 37-item shoulder functional status item pool had negligible differential item functioning
Journal of Clinical Epidemiology, 2006Measures of shoulder function may differ by dominance of affected shoulder, surgical history, gender, or race. We present a technique for determining whether observed differences in function between groups are due to biased test items or real differences in function.Four hundred patients who were receiving rehabilitation for a variety of shoulder ...
Paul K, Crane +3 more
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Differential Item Functioning in Attitude Assessment
Evaluation Practice, 1997Differential item functioning (DIF) is not often seen in the literature on attitude assessment. A brief discussion of DIF and methods of implementation is followed by an illustrative example from a program evaluation, using an attitude-towards-science scale with 1550 children in grades one through six.
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