Wolfgang Viechtbauer
@wviechtb.bsky.social
Assoc Prof of Methodology and Statistics at Maastricht University. Interests: meta-analysis, ESM/EMA, mixed-effects models, computational statistics, research software, R, FLOSS, GNU/Linux, chess, piano, lolcats. The views expressed are those of my cats.
For the revision for our "Meta-Analysis with JASP, Part I: Classical Approaches" tutorial, I recorder a series of YouTube videos walking through the examples in JASP www.youtube.com/watch?v=mbou... First time doing this. Do you find walkthroughs like this useful? Let me know any suggestions!
Meta-Analysis with JASP, Part I: Classical Approaches (Example 1)
YouTube video by JASP Statistics
youtube.com
🐦 Thrilled to share our latest research, a milestone: the first first-author paper from @shreyadimri.bsky.social, published in @royalsocietypublishing.org Why do birds add fresh green nest material to their nests? 🧵 🔗 doi.org/10.1098/rspb...
What's up with all these apparently fake data science accounts? bsky.app/profile/ds-w... bsky.app/profile/ds-f... bsky.app/profile/ds-j... bsky.app/profile/ds-b... bsky.app/profile/ds-n... ... What's the endgame here?
#canihazpdf Löchner, J., Santangelo, P.S., Ansell, E.B. et al. Ambulatory assessment in mental health: expert consensus and recommendations. Nat. Mental Health 4, 926–935 (2026). doi.org/10.1038/s442...
Ambulatory assessment in mental health: expert consensus and recommendations - Nature Mental Health
This Consensus Report addresses the methodological variability in ambulatory assessment studies within mental health. Utilizing a Delphi-adapted process with 26 experts, it offers best-practice recomm...
doi.org
The standard random-effects model in meta-analysis assumes that the amount of heterogeneity is homoscedastic. This assumption may not be true. I derived and examined various tests for heteroscedastic heterogeneity. See osf.io/cavhy for a preprint describing these methods. #MetaAnalysis #RStats
OSF
osf.io
As another alternative to the standard forest plot for visualizing many effect size estimates in a meta-analysis, one can use 'orchard plots' (Nakagawa et al., 2021). Example code to create such figures can be found here: www.metafor-project.org/doku.php/plo... #MetaAnalysis #RStats
In large meta-analyses, standard forest plot can become excessively large. One solution is to group the estimates together within studies. I just added an example to the metafor website illustrating this possibility: www.metafor-project.org/doku.php/plo... #MetaAnalysis #RStats
The third edition of the Open Handbook of Experience Sampling Methodology is out! The book includes 14 chapters that cover all aspects of designing, running, and analyzing the data from an ESM/EMA study. The book is freely available here: www.kuleuven.be/samenwerking...
Had a fantastic time last week in Trondheim at the @eshackathon.bsky.social 🇳🇴 A full week discussing evidence synthesis & how to improve it with a brilliant and knowledgeable interdisciplinary team. Highly energising! 🙌 Thank you to @drmattg.bsky.social for hosting us & taking such good care of us
I recently reviewed a paper for a top journals in statistics that was written front to back with a LLM. To make things worse, the conclusions drawn from the simulation study did not match what the results actually showed and instead just conformed to what the authors intended to show.
I asked ChatGPT to imagine what my ideal retirement will look like. This is what it came up with.
Speaking of crazy d values, this reminds me of this feature I was thinking about adding to the forest() function in metafor. #Rstats #MetaAnalysis
Ian Hussey (@ianhussey.mmmdata.io) contacted me about the recurring problem of unusually large SMD values appearing in published meta-analyses. Very large SMDs can result from using SEs in place of SDs in their calculation, which is a mistake I have also seen in practice. 1/4
A new version (1.6-0) of the metadat package (wviechtb.github.io/metadat/) has been released on CRAN (cran.r-project.org/package=meta...). The package provides over 100 meta-analytic datasets, which are useful for teaching and testing purposes. #RStats #MetaAnalysis
Meta-Analysis Datasets
A collection of meta-analysis datasets for teaching purposes, illustrating/testing meta-analytic methods, and validating published analyses.
wviechtb.github.io
A new version (5.0-1) of the metafor package has been released on CRAN. It includes some smaller updates, including more ways to visualize prediction intervals / distributions. Further details here: www.metafor-project.org/doku.php/new... #Rstats #MetaAnalysis
The best of both worlds: `<=` <- .Primitive("<-") x <= c(2,5,6) mean(x) #Rstats
Why has nobody ever told me that a snake fight is part of a PhD defense? www.mcsweeneys.net/articles/faq...
FAQ: The “Snake Fight” Portion of Your Thesis Defense
March 13 2022 4/24/23 5/8/24 CALENDAR 2027
mcsweeneys.net
@lajeunesselab.bsky.social has written the paper that meta-analysts were waiting for, and I can't recommend it more: Converting and Constructing Effect Sizes With the Response Ratio doi.org/10.1111/ele.... Go check it out (and use it!)
Two new papers out! 🎉 We revisited the idea that oxytocin promotes prosocial behaviour by collecting new data (n=211) and pooling it with data from another recent large-scale replication attempt (n=321).
Absence of a meaningful effect of intranasal oxytocin on trusting behavior: a registered report with pooled equivalence testing
The neuropeptide oxytocin (OXT) is thought to modulate important aspects of prosocial behavior. In a seminal paper, Kosfeld et al. (2005) reported tha…
sciencedirect.com
I rarely use Windows, but noticed that #Rstats plots under Windows (using windows()) looked very fuzzy even with a 4k resolution. This seems to be related to DPI scaling (the system was using 200%). If I override the DPI settings for Rgui, then things are nice and crisp. Is this common knowledge?
Owning a house is how I personally verified the Second Law of Thermodynamics: If you stop adding energy, money, and time into it, everything falls apart.
Whenever I read 'battery of questionnaires', I think of ...
Given that John Watts studied psychology, you can't tell me that the band name Fischer-Z is not actually based on Fisher's r-to-z transformation (and that the 'fish's head' pun was invented later).
For people in #academia -- What's the oldest email in your inbox that you still plan to respond to at some indeterminate timepoint in your life? (in other words: Please make me feel better about my inbox of shame)
You arrive at #Oslo airport, stand at the baggage claim, wonder why you have wifi, and realize that #eduroam works in the entire airport.
a man with red hair and a beard is standing in the woods
Alt: A man with red hair and a beard is standing in the woods and giving an approving nod.
media.tenor.com
The plotannotate package (#RStats) is now on CRAN: cran.r-project.org/package=plot... The package allows users to annotate base R graphics plots with freehand drawing, symbols, and text. This is useful for teaching (e.g., to visually explain certain plot elements) and creating quick sketches.
plotannotate: Annotate Plots
Interactively annotate 'base R graphics' plots with freehand drawing, symbols (points, lines, arrows, rectangles, circles, ellipses), and text. This is useful for teaching, for example to visually exp...
cran.r-project.org
The paper about splines in R that I wish I had known about when I was learning splines in R. bmcmedresmethodol.biomedcentral.com/articles/10....
A review of spline function procedures in R - BMC Medical Research Methodology
Background With progress on both the theoretical and the computational fronts the use of spline modelling has become an established tool in statistical regression analysis. An important issue in splin...
bmcmedresmethodol.biomedcentral.com
