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Related Experiment Video

Updated: Dec 25, 2025

Author Spotlight: Validation of SICOLE-R for Assessing Cognitive and Reading Skills in Spanish-Speaking Children and Its Role in Personalized Education

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When Does Differential Item Functioning Matter for Screening? A Method for Empirical Evaluation.

Oscar Gonzalez¹, William E Pelham²

¹University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

|April 7, 2020

Summary

This summary is machine-generated.

Differential item functioning (DIF) can impact screening accuracy. This study extends a method to quantify DIF

Keywords:

differential item functioning impact item response theory measurement bias screener sensitivity specificity

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Area of Science:

Psychometrics
Educational Measurement
Statistical Modeling

Background:

Differential Item Functioning (DIF) is common in screening measures.
Existing DIF detection methods lack guidance on impact on screening accuracy.
Prior methods to quantify DIF's impact on screening were limited to continuous items.

Purpose of the Study:

To extend the Millsap and Kwok procedure for quantifying DIF's impact on screening accuracy to discrete items.
To provide R functions for applying the extended procedure.
To evaluate the methodology using published data and simulation.

Main Methods:

Extension of the Millsap and Kwok procedure to discrete items.
Development of R functions for practical application.
Illustration with published screening data and a simulation study.

Main Results:

The extended procedure effectively accommodates discrete items in screening measures.
The R functions facilitate the application of the methodology.
Empirical evaluation demonstrated the utility of the proposed approach.

Conclusions:

Researchers should empirically assess the impact of DIF on screening performance.
The extended method and R functions offer a valuable tool for evaluating DIF in discrete screening measures.
This work enhances the understanding of DIF's practical implications in screening.