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Methods Of Detecting Differential Item Functioning: A Comparison Of Item Response Theory And Confirmatory Factor Analysis, Ratchaneewan Wanichtanom
Methods Of Detecting Differential Item Functioning: A Comparison Of Item Response Theory And Confirmatory Factor Analysis, Ratchaneewan Wanichtanom
Psychology Theses & Dissertations
Differential item functioning (DIF) occurs when an item performs statistically differently for a reference group than for a focal group. DIF is a threat to the validity of a test, and it can lead to illegal usage of a test in situations such as employee selection. Thus, DIF has important implications for test construction and practice. This research is a Monte Carlo study that compares Item Response Theory (IRT) and three Confirmatory Factor Analysis (CFA) methods for detecting DIF. The three CFA methods were Model Comparison (MC), Modification Indexes (MI), and Modification Indexes-Divided sample (MI-Divided).
The research compared the detection …