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
Harmonization
of cross-national survey data under the EU funded Infra4NextGen project
Forschung
My research interests center around psychometric
properties of scores obtained from measurement instruments. Currently, I am focused
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.
