Older News
2025-02-04: A new version (1.4-0) of the metadat package has been released on CRAN.
2025-01-28: A new version (4.8-0) of the metafor package has been released on CRAN.
2025-01-06: I just updated the schedule for my office hours and my live streams.
2024-09-02: Last week, I gave a talk as part of a symposium on 'Recent Advances in Meta-Analysis' (organized by the Department of Medical Statistics at the University Medical Center in Göttingen, Germany) about model selection in complex meta-analyses. You can find the slides for this presentation (and the code for the examples) here.
2024-07-05: I have updated the schedule for the Open Online R Stream for the second half of this year.
2024-07-04: And I just gave a similar presentation at the Annual Meeting of the Society for Research Synthesis Methodology. Again, the slides can be found here.
2024-06-07: I recently gave a colloquium talk for the Department of Psychology at the University of Münster. The talk was about the 'fail-safe N method' and its generalization to random-effects models. If you are interested, you can find the slides for this presentation here.
2024-03-28: Version 4.6-0 of the metafor package is out.
2024-01-08: Happy New Year! I have updated the schedule for my office hours and live streams.
2023-10-01: I just released a new version (4.4-0) of the metafor package a few days ago. See here for details. On 2023-10-19, I will cover some of the recent updates in the package during a live stream.
2023-09-10: I have finally managed to arrange another round of the ESM Data Analysis Course, which will take place December 6-8, 2023. See the link for more information about the course and how to register if you would like to participate.
2023-08-27: I just gave a brief demo of the metafor package as part of the symposium 'Recent Advances in Meta-Analysis: Methods and Software' which was held at the University Medical Center Göttingen in Germany. If you are interested in the slides, you can find them here.
2023-08-07: New dates for the Open Online R Stream have been scheduled. I've also updated the dates for my office hours.
2023-07-30: I recently attended two conferences, the annual meeting of the Society for Research Synthesis Methodology and the European Congress of Methodology, where I gave presentations on some recent updates to the metafor package and on methods for obtaining confidence intervals for the pseudo-R² statistic in meta-regression models. You can find the slides for those presentations here.
2023-05-09: A new version (4.2-0) of the metafor package has been released on CRAN.
2023-03-29: Just gave a presentation on 'Location-scale models for meta-analysis using the metafor package' as part of the Evidence Synthesis & Meta-Analysis in R Conference. The slides and R code are available here.
2023-03-19: A new version (4.0-0) of the metafor package has been released on CRAN.
2023-03-08: The next book to be covered on my weekly live streams is Regression and Other Stories by Gelman, Hill, and Vehtari. I will intersperse this with some 'Introduction to R' sessions (see the schedule).
2023-02-17: New article out on how to deal with missing standard deviations in meta-analyses of response ratios (i.e., log transformed ratios of means): https://doi.org/10.1111/ele.14144.
2023-02-06: The 2023 Evidence Synthesis and Meta-Analysis in R Conference will take place March 27-31. The conference is completely free (voluntary donations welcome). More details here. On March 24th, I will give a free pre-conference workshop on meta-analysis with R.
2022-11-07: Like many other people, I am migrating from Twitter to Mastodon. My profile there can be found here (or search for me under @wviechtb@scholar.social). Hope to (re)connect with you there!
2022-09-22: I just gave a talk as part of the workshop Open Science: Promoting transparency & replicability in research at the University of Tübingen. I talked about meta-analysis, how it relates to open science, and described various methods for addressing publication bias. The slides from my talk can be found here (and there is also a small R script to illustrate some of the techniques that I described during the talk here).
2022-08-09: I will teach my three-day meta-analysis course again this year, on November 2-4. For further details, see here.
2022-07-19: The next batch of live streams have been scheduled (see here for the schedule).
2022-06-26: A repo at GitHub is now available for my live streams for those that prefer using this way of fetching the materials corresponding to each session.
2022-06-17: I gave a fun little talk yesterday at the DSRI Community Event (DSRI is a cluster computer at Maastricht University) on how I recently used the cluster for a massive Monte Carlo simulation study using 600 cores. The slides from my talk can be found here.
2022-06-02: I am teaching a course on Standard and Advanced Methods for Meta-Analysis with R on September 8-9, 2022, at the University of Zurich. More info can be found here.
2022-06-01: Really happy about this article on location-scale models for meta-analysis appearing in Research Synthesis Methods: https://doi.org/10.1002/jrsm.1562