The MIMIC Method With Scale Purification for Detecting Differential Item Functioning

Wen‐Chung Wang · Ching‐Lin Shih · Chih-Chien Yang

69 citations0/0 files storedEducational and Psychological Measurement

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Psychometric Methodologies and Testing Educational Assessment and Pedagogy Educational Technology and Assessment

Abstract

This study implements a scale purification procedure onto the standard MIMIC method for differential item functioning (DIF) detection and assesses its performance through a series of simulations. It is found that the MIMIC method with scale purification (denoted as M-SP) outperforms the standard MIMIC method (denoted as M-ST) in controlling false-positive rates and yielding higher true-positive rates. Only when the DIF pattern is balanced between groups or when there is a small percentage of DIF items in the test does M-ST perform as appropriately as M-SP. Moreover, both methods yield a higher true-positive rate under the two-parameter logistic model than under the three-parameter model. M-SP is preferable to M-ST, because DIF patterns in real tests are unlikely to be perfectly balanced and the percentages of DIF items may not be small.

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References

2012Applications of Item Response Theory To Practical Testing Problems 1968Some latent trait models and their use in inferring an examinee's ability 1990Detecting Differential Item Functioning Using Logistic Regression Procedures 2013Differential Item Performance and the Mantel–Haenszel Procedure 1987On the Relationship between iTem Response Theory and Factor Analysis of Discretized Variables 1993A Model-Based Standardization Approach that Separates True Bias/DIF from Group Ability Differences and Detects Test Bias/DTF as well as Item Bias/DIF 1988The Area between Two Item Characteristic Curves 1992A Didactic Explanation of Item Bias, Item Impact, and Item Validity From a Multidimensional Perspective

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2010MIMIC Methods for Assessing Differential Item Functioning in Polytomous Items 2019MIMIC Models for Uniform and Nonuniform DIF as Moderated Mediation Models 2019Testing Differential Item Functioning in Small Samples

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