• Publications
  • Influence
Degrees of Freedom in Planning, Running, Analyzing, and Reporting Psychological Studies: A Checklist to Avoid p-Hacking
The designing, collecting, analyzing, and reporting of psychological studies entail many choices that are often arbitrary. The opportunistic use of these so-called researcher degrees of freedom aimedExpand
  • 227
  • 10
  • PDF
Meta-analysis using effect size distributions of only statistically significant studies.
Publication bias threatens the validity of meta-analytic results and leads to overestimation of the effect size in traditional meta-analysis. This particularly applies to meta-analyses that featureExpand
  • 143
  • 8
  • PDF
Why Publishing Everything Is More Effective than Selective Publishing of Statistically Significant Results
Background De Winter and Happee [1] examined whether science based on selective publishing of significant results may be effective in accurate estimation of population effects, and whether this isExpand
  • 85
  • 2
  • PDF
Conducting Meta-Analyses Based on p Values
TLDR
We show that in some situations, p-curve behaves erratically, whereas p-uniform may yield implausible estimates of negative effect size. Expand
  • 86
  • 2
  • PDF
The Effect of Publication Bias on the Q Test and Assessment of Heterogeneity
Abstract One of the main goals of meta-analysis is to test for and estimate the heterogeneity of effect sizes. We examined the effect of publication bias on the Q test and assessments ofExpand
  • 24
  • 1
Multistep estimators of the between‐study variance: The relationship with the Paule‐Mandel estimator
A wide variety of estimators of the between‐study variance are available in random‐effects meta‐analysis. Many, but not all, of these estimators are based on the method of moments. TheExpand
  • 8
  • 1
Publication bias examined in meta-analyses from psychology and medicine: A meta-meta-analysis
Publication bias is a substantial problem for the credibility of research in general and of meta-analyses in particular, as it yields overestimated effects and may suggest the existence ofExpand
  • 36
  • PDF
Distributions of p-values smaller than .05 in psychology: what is going on?
Previous studies provided mixed findings on pecularities in p-value distributions in psychology. This paper examined 258,050 test results across 30,710 articles from eight high impact journals toExpand
  • 39
  • PDF
A new justification of the Hartung‐Knapp method for random‐effects meta‐analysis based on weighted least squares regression
TLDR
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Expand
  • 5
Examining reproducibility in psychology: A hybrid method for combining a statistically significant original study and a replication
The unrealistically high rate of positive results within psychology has increased the attention to replication research. However, researchers who conduct a replication and want to statisticallyExpand
  • 10
  • PDF
...
1
2
...