Sample interview questions: Have you conducted any research on differential item functioning (DIF) or item bias?
Sample answer:
Research on Differential Item Functioning (DIF)
Yes, I have conducted extensive research on differential item functioning (DIF), utilizing advanced statistical techniques such as the Mantel-Haenszel procedure and logistic regression analysis. My research has focused on identifying and mitigating bias in educational and psychological assessments.
Findings and Contributions:
- Developed novel methods for detecting and quantifying DIF, including item-level and group-level analyses.
- Demonstrated the prevalence and impact of DIF in various assessment contexts, including achievement tests, aptitude tests, and diagnostic instruments.
- Identified specific item characteristics and group differences that contribute to DIF, providing valuable insights for test developers and users.
- Developed and evaluated strategies for reducing DIF, such as item modification and test equating approaches. Read full answer