Jelte M. Wicherts
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View article: What it takes to tutor—A preregistered direct replication of the scaffolding experimental study by D. Wood et al. (1978).
What it takes to tutor—A preregistered direct replication of the scaffolding experimental study by D. Wood et al. (1978). Open
Scaffolding, which can be summarized as the right instructional support at the right moment in time, is often mentioned as an important feature of effective teaching. The present study is a preregistered direct replication of the cornersto…
View article: Effects of a Brief Intervention on Students’ Sense of Belonging
Effects of a Brief Intervention on Students’ Sense of Belonging Open
Sense of belonging (SOB), the opposite of alienation, is considered one of the key components of students’ well-being. While past research has aimed to improve minority students’ SOB, the current study at a Dutch university addresses all f…
View article: The Impact of Publication Bias and Single and Combined p-Hacking Practices on Effect Size and Heterogeneity Estimates in Meta-Analysis
The Impact of Publication Bias and Single and Combined p-Hacking Practices on Effect Size and Heterogeneity Estimates in Meta-Analysis Open
Publication bias and p-hacking threaten the validity of inferences drawn from individualpsychological studies and meta-analyses by distorting effect size estimates and between-studyheterogeneity. In two simulation studies, we examined the …
View article: Good, bad, different or something else? A scoping review of the convictions, conventions and developments around quality in qualitative research
Good, bad, different or something else? A scoping review of the convictions, conventions and developments around quality in qualitative research Open
We present a scoping review of methodological papers in the social science literature covered in Scopus from 2017 to 2022. In this review, we document the shared norms, ideals and practices regarding the quality of qualitative research met…
View article: Registered Replication Report: Johns, Schmader, & Martens (2005)
Registered Replication Report: Johns, Schmader, & Martens (2005) Open
Stereotype threat refers to the fear of being judged based on negative stereotypes about the performance of a certain group one identifies with. Numerous published studies have found that stereotype threat might lower mathematics test perf…
View article: Correction: How do psychology researchers interpret the results of multiple replication studies?
Correction: How do psychology researchers interpret the results of multiple replication studies? Open
View article: Testing Measurement Invariance Across Gender in a Low Resource Setting Using the Computerized Battery for Neuropsychological Evaluation of Children (BENCI)
Testing Measurement Invariance Across Gender in a Low Resource Setting Using the Computerized Battery for Neuropsychological Evaluation of Children (BENCI) Open
Background Developing culture‐fair tests that measure constructs equivalently across different ethno‐lingual groups is challenging, given the diverse cultural variations that impact neurocognitive measurement. Multi‐level measurement invar…
View article: Assessing Reliable and Valid Measurement as a Prerequisite for Informative Replications in Psychology
Assessing Reliable and Valid Measurement as a Prerequisite for Informative Replications in Psychology Open
For a replication to be informative, measurement should be reliable and valid in bothoriginal and replication studies. Recent studies have identified problems with measurementand measurement reporting in both original and replication studi…
View article: Registered Replication Report: Johns, Schmader, & Martens (2005)
Registered Replication Report: Johns, Schmader, & Martens (2005) Open
Stereotype threat refers to the fear of being judged based on negative stereotypes about the performance of a certain group one identifies with. Numerous published studies have found that stereotype threat might lower mathematics test perf…
View article: Subjective evidence evaluation survey for many-analysts studies
Subjective evidence evaluation survey for many-analysts studies Open
Many-analysts studies explore how well an empirical claim withstands plausible alternative analyses of the same dataset by multiple, independent analysis teams. Conclusions from these studies typically rely on a single outcome metric (e.g.…
View article: Implementing <i>Statcheck</i> During Peer Review Is Related to a Steep Decline in Statistical-Reporting Inconsistencies
Implementing <i>Statcheck</i> During Peer Review Is Related to a Steep Decline in Statistical-Reporting Inconsistencies Open
We investigated whether statistical-reporting inconsistencies could be avoided if journals implement the tool statcheck in the peer-review process. In a preregistered pretest–posttest quasi-experiment covering more than 7,000 articles and …
View article: Subjective Evidence Evaluation Survey For Many-Analysts Studies
Subjective Evidence Evaluation Survey For Many-Analysts Studies Open
Many-analysts studies explore how well an empirical claim withstands plausible alternative analyses of the same data set by multiple, independent analysis teams. Conclusions from these studies typically rely on a single outcome metric (e.g…
View article: The dire disregard of measurement invariance testing in psychological science.
The dire disregard of measurement invariance testing in psychological science. Open
Self-report scales are widely used in psychology to compare means in latent constructs across groups, experimental conditions, or time points. However, for these comparisons to be meaningful and unbiased, the scales must demonstrate measur…
View article: Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology
Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology Open
View article: PSYCHOMETRIC EVALUATION OF THE COMPUTERIZED BATTERY FOR NEUROPSYCHOLOGICAL EVALUATION OF CHILDREN (BENCI) AMONG SCHOOL AGED CHILDREN IN THE CONTEXT OF HIV IN A KENYAN SETTING
PSYCHOMETRIC EVALUATION OF THE COMPUTERIZED BATTERY FOR NEUROPSYCHOLOGICAL EVALUATION OF CHILDREN (BENCI) AMONG SCHOOL AGED CHILDREN IN THE CONTEXT OF HIV IN A KENYAN SETTING Open
View article: Comparing the prevalence of statistical reporting inconsistencies in COVID-19 preprints and matched controls: a registered report
Comparing the prevalence of statistical reporting inconsistencies in COVID-19 preprints and matched controls: a registered report Open
The COVID-19 outbreak has led to an exponential increase of publications and preprints about the virus, its causes, consequences, and possible cures. COVID-19 research has been conducted under high time pressure and has been subject to fin…
View article: Correcting for outcome reporting bias in a meta-analysis: A meta-regression approach
Correcting for outcome reporting bias in a meta-analysis: A meta-regression approach Open
Outcome reporting bias (ORB) refers to the biasing effect caused by researchers selectively reporting outcomes within a study based on their statistical significance. ORB leads to inflated effect size estimates in meta-analysis if only the…
View article: Implementing statcheck during peer review is related to a steep decline in statistical reporting inconsistencies
Implementing statcheck during peer review is related to a steep decline in statistical reporting inconsistencies Open
We investigated whether statistical reporting inconsistencies could be avoided if journals implement the tool statcheck in the peer review process. In a preregistered pretest-posttest quasi-experiment covering over 7000 articles and over 1…
View article: Selective Hypothesis Reporting in Psychology: Comparing Preregistrations and Corresponding Publications
Selective Hypothesis Reporting in Psychology: Comparing Preregistrations and Corresponding Publications Open
In this study, we assessed the extent of selective hypothesis reporting in psychological research by comparing the hypotheses found in a set of 459 preregistrations with the hypotheses found in the corresponding articles. We found that mor…
View article: Unreliable Heterogeneity: How Measurement Error Obscures Heterogeneity in Meta-analyses in Psychology
Unreliable Heterogeneity: How Measurement Error Obscures Heterogeneity in Meta-analyses in Psychology Open
Measurement error (imperfect reliability) is present in any empirical effect size estimate and systematically attenuates observed effect sizes compared to true underlying effect sizes. Yet there exist broad concerns that proper measurement…
View article: The effects of height-for-age and HIV on cognitive development of school-aged children in Nairobi, Kenya: a structural equation modelling analysis
The effects of height-for-age and HIV on cognitive development of school-aged children in Nairobi, Kenya: a structural equation modelling analysis Open
Background Empirical evidence indicates that both HIV infection and stunting impede cognitive functions of school-going children. However, there is less evidence on how these two risk factors amplify each other’s negative effects. This stu…
View article: Assessing QRPs and RRPs in Psychology Masters’ Theses
Assessing QRPs and RRPs in Psychology Masters’ Theses Open
Recent research documented both questionable and responsible research practices in published psychology research, but it is unclear what psychology students are taught and which research practices they engage in when graduating their maste…
View article: Why most published research on Type D personality needs to be reanalyzed
Why most published research on Type D personality needs to be reanalyzed Open
View article: Psychometric evaluation of the computerized battery for neuropsychological evaluation of children (BENCI) among school aged children in the context of HIV in an urban Kenyan setting
Psychometric evaluation of the computerized battery for neuropsychological evaluation of children (BENCI) among school aged children in the context of HIV in an urban Kenyan setting Open
View article: Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology
Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology Open
Preregistration has gained traction as one of the most promising solutions to improve the replicability of scientific effects. In this project, we compared 193 psychology studies that earned a Preregistration Challenge prize or Preregistra…
View article: Meta-analyzing the multiverse: A peek under the hood of selective reporting.
Meta-analyzing the multiverse: A peek under the hood of selective reporting. Open
Researcher degrees of freedom refer to arbitrary decisions in the execution and reporting of hypothesis-testing research that allow for many possible outcomes from a single study. Selective reporting of results (p-hacking) from this…
View article: The effectiveness of preregistration in psychology: Assessing preregistration strictness and preregistration-study consistency
The effectiveness of preregistration in psychology: Assessing preregistration strictness and preregistration-study consistency Open
Study preregistration has become increasingly popular in psychology, but its potential to restrict researcher degrees of freedom has not yet been empirically verified. We used an extensive protocol to assess the producibility (i.e., the de…
View article: Preprint_vanAert_etal_Covid19
Preprint_vanAert_etal_Covid19 Open
The COVID-19 outbreak has led to an exponential increase of publications and preprints about the virus, its causes, consequences, and possible cures. COVID-19 research has been conducted under high time pressure and has been subject to fin…
View article: The Meta-Plot
The Meta-Plot Open
The meta-plot is a descriptive visual tool for meta-analysis that provides information on the primary studies in the meta-analysis and the results of the meta-analysis. More precisely, the meta-plot portrays (1) the precision and statistic…
View article: The process of replication target selection in psychology: what to consider?
The process of replication target selection in psychology: what to consider? Open
Increased execution of replication studies contributes to the effort to restore credibility of empirical research. However, a second generation of problems arises: the number of potential replication targets is at a serious mismatch with a…