On December 21st Beibei Yuan has defended her thesis The δ-machine: Classification based on dissimilarities towards prototypes at the Leiden University. Read more.
Dissertation Leonie Vogelsmeier on January 14th 2022
On January 14th 2022 Leonie Vogelsmeier has defended her thesis Latent Markov Factor Analysis:
A mixture modeling approach for evaluating within- and between-person measurement model differences in intensive longitudinal data at the University of Tilburg. Read more
Dissertation Joost Kruis on November 18th 2021
On November 18th 2021 Joost Kruis has defended his thesis Item response mechanics at the University of Amsterdam. Read more
IOPS Winter conference 9 – 10 December 2021
Dissertation Anne Elevelt on April 16th 2021
On April 16th 2021 Anne Elevelt has defended her thesis Smart(phone) Surveys at the University of Utrecht. Read more
Dissertation Lisa Wijsen on March 22nd 2021
On March 22nd 2021 Lisa Wijsen has defended her thesis Characterizations of Psychometrics at the University of Amsterdam. Read more
Prof. dr. Edith D. de Leeuw receives 2021 Monroe G. Sirken Award
2021 Monroe G. Sirken Award
The Monroe G. Sirken Award in Interdisciplinary Survey Research Methods Research was established in 2014 and is given annually to a distinguished survey researcher for contributions to interdisciplinary survey research that improve the theory and methods of collecting, verifying, processing, presenting, or analyzing survey data. This year’s winner is a distinguished scholar in the field of survey methodology, Dr. Edith de Leeuw.
Dr. de Leeuw is recognized for exemplary interdisciplinary contributions to survey research which illuminate the relationship between data quality and data collection methods, enhance understanding of the causes and consequences of nonresponse, and advance cross-cultural and cross-national measurement. Read more
Dissertation Erik-Jan van Kesteren on January 29th 2021
On January 29th 2021 Erik-Jan van Kesteren has defended his thesis (cum laude) Structural Equations with Latent Variables: Computational Solutions for Modern Data Problems at the Utrecht University. Read more
Save the date – Summer Conference 2021
See conference webpage for updated information
In memoriam Don Mellenbergh
Dear IOPS members,
Don Mellenbergh passed away on 27 March. Don Mellenbergh was one of the founding fathers and directors of IOPS. He was Emeritus Professor of Psychological Methods at the University of Amsterdam. He was born august 9 1938, studied Psychology at the University of Amsterdam and obtained his PhD under supervision of A.D. de Groot. He worked at the University of Amsterdam and University of Utrecht and was full professor at the University of Amsterdam from 1982-2003. He was also a member of the Royal Netherlands academy of Arts and Sciences (KNWA), and Editor of Psychometrika.
Don Mellenbergh published many papers on measurement in the behavioural sciences notably on test theory, utility, and validity. He developed the concept of item bias, coining the distinction between uniform and non-uniform bias, and laid a cornerstone for the now standard unified view of psychometric models with his famous publication on Generalized Linear
Item Response Theory. Perhaps even more important were his contributions to the social fabric of methodology. Mellenbergh acted as promotor of dozens of psychometricians, including Wim van der Linden, Henk Kelderman, and Denny Borsboom, and took the initiative to unite Dutch methodologists in IOPS.
Don Mellenbergh was a warm and friendly colleague. He was hardly interested in status, and as a social mover (Don was the son of a taxi driver) he continued to support equal opportunities for different groups throughout his life. Don always insisted that IOPS exists for the Ph.D. students, not for the staff, and regularly made this clear in practice. For example, at an IOPS conference in Maastricht in the 1990s where there were two hotels available – a regular one and a high class one – Don did not hesitate and reserved all the rooms in the high class hotel for the Ph.D. students.
Don Mellenbergh was passionate about his work, and after his retirement could frequently be found at the department of Psychological Methods of the University of Amsterdam. He published his last book, Counteracting methodological errors, in 2019 – sixteen years after his retirement – and at the time of his death was working on a book that documented changes in
academia over the past decades.
Don’s striking voice can be heard in the following interview: https://www.adng.nl/nl/interview/don-mellenberg/
We will remember Don as a very influential psychometrician that shaped our profession to the flourishing field it is today, a role model to many of today’s psychometricians, and a warm, supportive colleague whose spirit filled many IOPS conferences with joy and enthusiasm.
On behalf of Rob Meijer,
Chair of the IOPS board