Abstract
This study provides a comprehensive evaluation of the effects of differential item functioning (DIF) on proficiency classification. Using Monte Carlo simulation, item- and test-level DIF magnitudes were varied systematically to investigate their impact on proficiency classification at multiple decision points. Findings from this study clearly show that the presence of DIF affects proficiency classification not by lowering the overall correct classification rates but by affecting classification error rates differently for reference and focal group members. The study also reveals that multiple items with low levels of DIF can be particularly problematic. They can do similar damage to proficiency classification as high-level DIF items with the same cumulative magnitudes but are much harder to detect with current DIF and differential bundle functioning (DBF) techniques. Finally, how DIF affects proficiency classification errors at multiple cut scores is fully described and discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.