M
Marjan Bakker
Researcher at Tilburg University
Publications - 43
Citations - 2675
Marjan Bakker is an academic researcher from Tilburg University. The author has contributed to research in topics: Suicide prevention & Medicine. The author has an hindex of 15, co-authored 38 publications receiving 2191 citations. Previous affiliations of Marjan Bakker include University of Amsterdam.
Papers
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The Rules of the Game Called Psychological Science
TL;DR: This paper considers 13 meta-analyses covering 281 primary studies in various fields of psychology and finds indications of biases and/or an excess of significant results in seven, highlighting the need for sufficiently powerful replications and changes in journal policies.
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Degrees of Freedom in Planning, Running, Analyzing, and Reporting Psychological Studies: A Checklist to Avoid p-Hacking
Jelte M. Wicherts,Coosje Lisabet Sterre Veldkamp,Hilde E. M. Augusteijn,Marjan Bakker,Robbie C. M. van Aert,Marcel A.L.M. van Assen +5 more
TL;DR: An extensive list of 34 degrees of freedom that researchers have in formulating hypotheses, and in designing, running, analyzing, and reporting of psychological research is presented.
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Willingness to share research data is related to the strength of the evidence and the quality of reporting of statistical results
TL;DR: It is suggested that statistical results are particularly hard to verify when reanalysis is more likely to lead to contrasting conclusions, which highlights the importance of establishing mandatory data archiving policies.
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The (mis)reporting of statistical results in psychology journals
Marjan Bakker,Jelte M. Wicherts +1 more
TL;DR: The authors' results indicate that around 18% of statistical results in the psychological literature are incorrectly reported, and that errors were often in line with researchers’ expectations.
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The estimation of item response models with the lmer function from the lme4 package in R
Paul De Boeck,Marjan Bakker,Robert J. Zwitser,Michel G. Nivard,Abe D. Hofman,Francis Tuerlinckx,Ivailo Partchev +6 more
TL;DR: In this article, the potential of the lmer function from the lme4 package in R for item response (IRT) modeling is discussed, and three broad categories of models are described: item covariate models, person covariate model, and person-by-item model.