dr. Marjan Bakker

Bio

I’m Marjan Bakker and I’m an assistant professor at the Methods and Statistics department at Tilburg University. I want to improve science by investigating problems and possible solutions. I’m interested in reporting errors, the use of questionable research practices, statistical power, outliers in data, publication bias, and preregistration. Currently, I’m mainly working on some larger projects on preregistration and on a project to replicate Mahoney’s seminal study on publication bias (for which we got a NWO replication grant).

I also teach courses on regression analysis to psychology students (bachelor) and multilevel analysis to students from the research master and I like to work together with researchers from other departments.

Courses

• Correlational Research Methods
• Correlational Research Methods
• Applied Methods and Statistics
• Applied Methods and Statistics
• Research Master: Multivariate Analysis, including Multilevel Models

Recent publications

1. The Meta-Plot - A graphical tool for interpreting the results of a me…

   Van Assen, M. A. L. M., Van Den Akker, O. R., Augusteijn, H. E. M., Bakker, M., Nuijten, M. B., Olsson-Collentine, A., Stoevenbelt, A. H., Wicherts, J. M., & Van Aert, R. C. M. (2023). The Meta-Plot: A graphical tool for interpreting the results of a meta-analysis. Zeitschrift fur Psychologie / Journal of Psychology, 231(1), 65-78.

2. How do psychology researchers interpret the results of multiple repli…

   van den Akker, O. R., Wicherts, J. M., Alvarez, L. D., Bakker, M., & van Assen, M. A. L. M. (2023). How do psychology researchers interpret the results of multiple replication studies? Psychonomic Bulletin and Review.

3. Selective hypothesis reporting in psychology: - Comparing preregistra…

   Akker, O. V. D., Assen, M. A. L. M. V., Enting, M., Jonge, M. D., Ong, H. H., Rüffer, F. F., Schoenmakers, M., Stoevenbelt, A. H., Wicherts, J. M., & Bakker, M. (2022). Selective hypothesis reporting in psychology: Comparing preregistrations and corresponding publications. MetaArXiv Preprints.

4. The meta-plot - A graphical tool for interpreting the results of a me…

   Assen, M. A. L. M. V., Akker, O. V. D., Augusteijn, H. E. M., Bakker, M., Nuijten, M. B., Olsson-Collentine, A., Stoevenbelt, A. H., Wicherts, J. M., & Aert, R. C. M. V. (2022). The meta-plot: A graphical tool for interpreting the results of a meta-analysis. PsyArXiv Preprints.

5. The association between suicide-related media coverage and suicide - …

   Hofstra, E., Bakker, M., Diepstraten, C. A. M., Elfeddali, I., Lucas, M. S., van Nieuwenhuizen, C., & van der Feltz-Cornelis, C. M. (2022). The association between suicide-related media coverage and suicide: A cross-sectional observational study. Archives of Suicide Research, 26(3), 1094-1107.