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

• RM: Multiv.Analys., incl. Multil. Models
• Applied Methods and Statistics
• Correlational Research Methods
• Applied Methods & Statistics (Dutch Pr.)
• Correlational Research Methods (Dutch P)

Recent publications

1. Trial onder bijstandgerechtigden met psychische problemen - Stigma en…

   Brouwers, E. P. M., Janssens, K. M. E., Joosen, M. C. W., den Hollander, W., Bakker, M., & van Weeghel, J. (2024). Trial onder bijstandgerechtigden met psychische problemen: Stigma en discriminatie grote belemmering. Tijdschrift voor Bedrijfs- en Verzekeringsgeneeskunde, 32(4), 36-41.

2. Efficacy of a digitally supported regional systems intervention for s…

   Feltz-Cornelis, C. M. V. D., Hofstra, E., Elfeddali, I., Bakker, M., Metz, M., de Jong, J. J., & van Nieuwenhuizen, C. (2023). Efficacy of a digitally supported regional systems intervention for suicide prevention (SUPREMOCOL) in Noord-Brabant, the Netherlands. General Hospital Psychiatry: Psychiatry, Medicine and Primary Care, 84, 73 - 81.

3. Effectiveness of a stigma awareness intervention on reemployment of p…

   Janssens, K., Joosen, M., Henderson, C., Bakker, M., den Hollander, W., van Weeghel, J., & Brouwers, E. (2023). Effectiveness of a stigma awareness intervention on reemployment of people with mental health issues/mental illness: A cluster randomised controlled trial. Journal of Occupational Rehabilitation. Advance online publication.

4. Unreliable heterogeneity - how measurement errorobscures heterogeneit…

   Olsson Collentine, A., Bakker, M., & Wicherts, J. (2023). Unreliable heterogeneity: how measurement errorobscures heterogeneity in meta-analyses inpsychology. OSF Preprints.

5. Meta-analyzing the multiverse - A peek under the hood of selective re…

   Olsson-Collentine, A., van Aert, R. C. M., Bakker, M., & Wicherts, J. (2023). Meta-analyzing the multiverse: A peek under the hood of selective reporting. Psychological Methods. Advance online publication.