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When can Multidimensional Item Response Theory (MIRT) Models be a Solution for Differential Item Functioning (DIF)? A Monte Carlo Simulation Study
The present study was designed to examine whether multidimensional item response theory (MIRT) models might be useful in controlling for differential item functioning (DIF) when estimating primary ability, or whether traditional (and simpler) unidimensional item response theory (UIRT) models with DIF items removed are sufficient ...
Stability of Item Parameters in Equating Items
The paper investigates the item factors that may cause item parameter instability. The primary concern of standardized tests is the accuracy of test score interpretation and the appropriateness of test score use across multiple tests. Equating is essential for any testing program. Equating refers to a statistical process used ...