Die vielen Gesichter von GESIS
Vita
I am a postdoctoral researcher at the GESIS – Leibniz Institute for the Social Sciences in Cologne. I earned my Ph.D. degree in the Educational Measurement and Statistics Program at the University of Iowa (Iowa City, Iowa, USA). I have M.S. and Integrated B.S. & M.S. degree in Secondary School Mathematics Education from Bogazici University (Istanbul, Turkiye). Before joining the GESIS, I was an assistant professor of Educational Measurement and Evaluation at the Kastamonu University (Kastamonu, Turkiye). I served as a research assistant in multiple projects during my doctoral education. I was one of the 2011 Comenius Assistantship recipients, awarded by the European Union, which provided me the opportunity to gain teaching experience in Oviedo (Asturias, Spain).
Service
I am working on the harmonization of cross-national survey data under the EU-funded Infra4NextGen project. To have an overview of the work I do, please visit https://infra4nextgen.com/harmonisationgateway/.
Forschung
My research interests center around psychometric properties of scores obtained from measurement instruments. Currently, I focus on the use of equating and linking methodologies for harmonization and providing validity and reliability evidence for the harmonized data. Previously, I have done research on equating methodologies for adjusting differences in subscores, field testing new items in a computerized multistage adaptive testing design and place their item parameter estimates on the item pool scale using the IRT based linking methodologies, the reliability of difference scores within the multivariate generalizability theoretical framework.
Veröffentlichungen
Zeitschriftenaufsatz
Karatoprak Ersen, Rabia, Won-Chan Lee, and Donald B. Yarbrough. 2025. "Reliability of difference scores obtained from nested data within a multivariate generalizability theory framework." CASMA Research Report (59): . https://education.uiowa.edu/sites/education.uiowa.edu/files/2025-08/reliability_of_ds_CASMA_RR_59.pdf.
Konferenzbeitrag
Atalay Kabasakal, Kubra, and Rabia Karatoprak Ersen. 2025. "Exploring the relationship between sampling weights and population invariance property of equating. ." 11th IEA International Research Conference (IEA IRC), Roma Tre University, Rome, 2025-06-25.
Karatoprak Ersen, Rabia, and Insa Bechert. 2025. "The NextGen Harmonised Data Gateway." 11th conference of the European Survey Research Association (ESRA), Utrecht University, Utrecht, 2025-07-15.
Karatoprak Ersen, Rabia. 2025. "Use of random and systematic error for the evaluation of harmonized data." 11th conference of the European Survey Research Association (ESRA), Utrecht University, Utrecht, 2025-07-15.
Karatoprak Ersen, Rabia. 2024. "Evaluation of test equating methods for harmonization." GESIS Research Day 2024, GESIS - Leibniz-Institut für Sozialwissenschaften, Köln, 2024-10-10.