Examining the Impact of Differential Item Functioning on Classification Accuracy in Cognitive Diagnostic Models.

Applied Psychological Measurement
Justin PaulsenMontserrat Valdivia

Abstract

Cognitive diagnostic models (CDMs) are of growing interest in educational research because of the models' ability to provide diagnostic information regarding examinees' strengths and weaknesses suited to a variety of content areas. An important step to ensure appropriate uses and interpretations from CDMs is to understand the impact of differential item functioning (DIF). While methods of detecting DIF in CDMs have been identified, there is a limited understanding of the extent to which DIF affects classification accuracy. This simulation study provides a reference to practitioners to understand how different magnitudes and types of DIF interact with CDM item types and group distributions and sample sizes to influence attribute- and profile-level classification accuracy. The results suggest that attribute-level classification accuracy is robust to DIF of large magnitudes in most conditions, while profile-level classification accuracy is negatively influenced by the inclusion of DIF. Conditions of unequal group distributions and DIF located on simple structure items had the greatest effect in decreasing classification accuracy. The article closes by considering implications of the results and future directions.

References

Jul 15, 2015·Psychometrika·Gongjun Xu, Stephanie Zhang
May 26, 2018·Educational and Psychological Measurement·Ren LiuLaine Bradshaw
Jun 6, 2018·Frontiers in Psychology·Dubravka SvetinaShenghai Dai
Nov 1, 2016·Applied Psychological Measurement·Sun-Joo ChoWoo-Yeol Lee

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Methods Mentioned

BETA
PCA

Software Mentioned

DINA
R Core
ACA
R
SIBTEST
R package CDM

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