Jelte Wicherts
@JelteWicherts
Professor in methodology. Tweets about meta-research, intelligence, open science, methods, and bias & error in (psychological) science. Also proud father of 4
Nearly three-quarters of tested psychological scales failed the test of measurement invariance needed for meaningful group comparisons psycnet.apa.org/record/2024-39…

Classic educational psychology on scaffolding fails to replicate. doi.org/10.1037/edu000…

What it takes to tutor—A preregistered direct replication of the scaffolding experimental study by D. Wood et al. (1978). doi.org/10.1037/edu000…
Meta-analyzing the multiverse: A peek under the hood of selective reporting. doi.org/10.1037/met000…
The quality of qualitative research royalsocietypublishing.org/doi/10.1098/rs…
The stereotype threat effect, once one of social psychology's pet theories, gets hammered in another large-scale replication failure. Stereotype threat refers to the fear of being judged based on negative stereotypes about the performance of a certain group one identifies…
Implementing Statcheck During Peer Review Is Related to a Steep Decline in Statistical-Reporting Inconsistencies - Michèle B. Nuijten, Jelte M. Wicherts, 2024 journals.sagepub.com/doi/full/10.11…
🚨 New #metascience paper with @jeltewicherts, now accepted in AMPPS! 🚨 Using #statcheck in peer review is linked to decline in statistical reporting inconsistencies. 1/n 🧵
Vacancy: We are looking for two fully paid PhD students in methodology and statistics as part of my NWO-funded VICI project Examining Variation in Causal Effects in Psychology! academictransfer.com/nl/338321/phd-…

Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology @DenOlmo link.springer.com/article/10.375…

In more than half of 459 preregistered studies, hypotheses were added, omitted, or changed in the published papers. @DenOlmo journals.sagepub.com/doi/10.1177/25…


Selective outcome reporting can be corrected in meta-analyses (subject to assumptions) link.springer.com/article/10.375…

“Implementing statcheck during peer review is related to a steep decline in statistical reporting errors.” psyarxiv.com/qejhk/
“It is disheartening to see that even among…excellent early career researchers, misconduct and academic cheating appear common,” @JelteWicherts. Read the full story by @DalmeetS. physics.aps.org/articles/v16/90
Supervisors matter for open science doi.org/10.7554/eLife.…
19% of 755 phase 3 cancer trials had changes to the primary end points in the paper compared to the registration. 70% of those were not disclosed in the paper. Changes were associated with likelihood of a positive outcome (OR=1.86). jamanetwork.com/journals/jaman…
Preregistration in practice: A comparison of preregistered and non-preregistered studies in psychology The link to the preprint on @metaarxiv didn't work so I now uploaded it on OSF at osf.io/2m5zv @lakens @EvoMellor @MamsMandrill @JelteWicherts
In the 2nd paper, we surprisingly found that preregistered studies did NOT have lower proportions of statistically significant results NOR lower effect sizes. However, this may have been due to our selection of the control group.
Vacancy: two fully paid 4-year PhD positions in meta-research as part of the NWO-funded VICI project Examining Variation in Causal Effects in Psychology tiu.nu/21562

Did papers about COVID-19 (presumably written under high pressure) contain more statistical inconsistencies than non-COVID-19 papers? Our natural experiment assessing more than 533 preprint pairs did not find evidence for this. psyarxiv.com/asbfd