Our team consists of the following researchers:
dr. Jelte M. Wicherts
Jelte M. Wicherts (1976) obtained his PhD in Psychological Methods (2007, Cum Laude) from the University of Amsterdam, and is currently an associate professor in methodology and statistics at the Tilburg School of Social and Behavioral Sciences at Tilburg University. His research focuses on issues related to errors with statistics, publication bias, scientific integrity, questionable research practices, scientific misconduct, data sharing, replicability, and the measurement of intelligence (IQ). He has (co)authored 75+ papers in various (top) journals, obtained major research grants like a VIDI grant from the Netherlands Organization for Research (NWO), and is an affiliate member of the Meta-Research Innovation Center at Stanford (METRICS).
prof. dr. Marcel A. L. M. van Assen
Marcel van Assen (1972) is currently assistant professor at the department of Methodology and Statistics of Tilburg University, and is professor by special appointment at the Department of Sociology of Utrecht University, where he holds the endowed chair “Mathematical Sociology”.
He studied mathematical psychology at Radboud University (1996, cum laude), and obtained his PhD at Groningen University (2001, cum laude) after writing an interdisciplinary dissertation on the intersection of psychology, economics, and sociology.
He has more than fifty peer-reviewed publications on the following diverse range of topics:
meta-analysis, publication bias, game theory, social networks, individual decision making, collective decision making, social dilemmas, prisoner’s dilemma, exchange, exchange networks, research misconduct, errors with statistics, replication, psychometrics, auditory perception, visual perception, frailty, and secrets.
dr. Marjan Bakker – Assistant Professor
Marjan Bakker obtained her PhD (2014) in psychological methods from the University of Amsterdam and is currently assistant professor of methodology and statistics at the Tilburg School of Social and Behavioral Sciences at Tilburg University. Her dissertation is titled “Good science, bad science: Questioning Research Practices in Psychology”, and her research interests are scientific integrity, errors in statistics, statistical power, publication bias, preregistration, blind analysis, and psychometrics. She has published many highly cited papers that contributed to the current reproducibility debate in psychology.
Coosje L. S. Veldkamp – PhD Student
Coosje obtained her Research Master’s degree in Psychology from the University of Amsterdam, specializing in Social Psychology and Developmental Psychology. Her doctoral research focuses on the effectiveness of methods aimed at reducing human error and bias in science, on trust in and among scientists, and on the psychology of the scientist in general. She co-chaired the committee that organized the international symposium Human Factors in Science in 2014, featuring highly influential scientists in the field of meta-research (see here).
Michèle B. Nuijten – PhD Student
Michèle studied Psychology at the University of Amsterdam, where she specialized in research methods. Since 2012 she has been working on her doctoral dissertation at Tilburg University under supervision of Jelte Wicherts and Marcel van Assen. Her projects include topics such as publication bias, replication, and statistical reporting errors. Among other things she co-developed the R package “statcheck” that extracts statistical results from articles and recomputes p-values.
Paulette C. Flore – PhD Student
In 2013 Paulette obtained her Research Master degree in Social and Behavioral Sciences from Tilburg University (minor social psychology/methodology and statistics). Since then she worked under supervision of Jelte Wicherts and Daniel Oberski on her dissertation with the working title “the psychometrics of stereotype threat”. The focus of her studies lies on experimental social psychology, gender stereotype threat, meta-analysis, replications, and differential item functioning.
Robbie C. M. van Aert – PhD Student
After Robbie finished Research Master in Social and Behavioral Sciences (minor methodology and statistics/social sciences) at Tilburg University, he started my PhD at the department of methodology and statistics in Tilburg. Robbie’s dissertation is about conducting meta-analysis in the presence of publication bias and questionable research practices. His research interests encompass everything what has to do with statistical methods for meta-analyses.
Chris H. J Hartgerink – PhD Student
Chris Hartgerink is a PhD candidate specializing in detecting potentially problematic data in the social and medical sciences, caused by for example data fabrication. He develops and validates detection methods based on summary results and raw data, which can be applied to estimate prevalence of problematic data at the paper level. Besides this, he is specialized in R development, webscraping, text-mining, transparent research, research integrity, and Open Access of scholarly articles. He is a signee of the Hague declaration to promote text-mining and the Declaration of Research Assessment to promote the use of scientifically validated indices to evaluate scholars (and not the unscientific Impact Factor).
Hilde E. M. Augusteijn – PhD Student
During her research master in communication and information sciences Hilde’s interest in meta-analysis grew stronger, along with her amazement about publication bias and questionable research practices.
Hilde’s current PhD project combines these interests: Developing meta-analystic methods that correct for publication bias and p-hacking when estimating effect sizes, heterogeneity and moderator effects.
Having her own roots in practical research, Hilde hopes to expand the toolbox of meta-analysts in a way that will help and improve their work.