Ronald K. Hambleton's Advances in Detecting Item Bias, Differential Item Functioning (full-length)

"Ronald K. Hambleton's Advances in Detecting Item Bias, Differential Item Functioning" invited National Council on Measurement in Education (NCME) 2023 conference session titled "Remembering Ron: Reflections on a Career and a Legacy." [Outline, Summary, and Abstract below] Outline 1. Introduction: 0:00 2. Opening remarks - timestamp: 0:45 3. What is DIF? - timestamp: 2:40 4. Purpose of the presentation- timestamp: 4:31 5. Impact of Hambleton's research on DIF using bibliometric analysis - timestamp: 7:21 6. Some observations on the results of the bibliometric analysis - timestamp: 10:40 7. Hambleton's three most cited publications on DIF - timestamp: 13:01 8. Remarks on Hambleton's "Good practices for identifying DIF: multiple tests and using effect sizes" - timestamp: 14:11 9. A model of the life of a scholar - timestamp: 22:01 10. Ron the Canadian scholar - timestamp: 27:16 11. A song whose lyrics say Canada loved him back - timestamp: 28:10 Symposium summary: In this session, we honor the late Professor Hambleton's life work with an eye to continuing his legacy. Five of Professor Hambleton's colleagues or close collaborators, Wim van der Linden, Ric Luecht, Jose Muniz, April Zenisky, and Bruno Zumbo, were invited to speak on topics to which Professor Hambleton made monumental contributions. His longtime colleague, H. Swaminathan, was invited as the discussant. Bruno D. Zumbo, University of British Columbia Abstract: Professor Zumbo's presentation describes Professor Hambleton's advances in detecting item bias and differential item functioning (DIF). Over 37 years, Ron made significant advances in the psychometric, statistical, and research methodology for the detection of DIF and the refinement of these methods, as well as their application on topics as diverse as (i) educational and psychological assessment, (2) cross-cultural assessment, (3) health measurement and health care, (4) education research, (5) credentialing exams, and (6) language testing. I provide a synthesis of Ron's body of research on DIF that includes a bibliometric and quantitative thematic analysis shaped by a personal connection to the man and his ideas. He published many papers and chapters dating back to 1986 that have garnered nearly 2,000 citations so far. The largest number of publications were on psychometric, statistical, and research methods, followed by adaptation and translation of instruments and tests and cross-cultural research. The presentation will describe Ron's emergent view of good practices for DIF studies, reflecting his decades of DIF research.