A Meta-Analysis Package for R https://mail.metafor-project.org/ 2026-04-17T14:15:49+00:00 https://mail.metafor-project.org/ https://mail.metafor-project.org/lib/exe/fetch.php/wiki:logo.png text/html 2025-09-29T06:43:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news?rev=1759128181 Package News 2025-09-20: 20,000+ Citations for the JSS Paper In 2010, I published a paper about the metafor package in the Journal of Statistical Software (Viechtbauer, 2010). I have been fortunate enough that users of the package have been quite diligent in citing the package in their papers. Today another milestone was reached, with the paper being cited $R^2$ text/html 2023-05-09T06:37:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2014?rev=1683614260 Package News for 2014 2014-12-15: Heterogeneity Estimators Galore I added an example to the analysis examples section showing how to reproduce the results from one of the illustrative datasets used in the article by DerSimonian and Kacker (2007), and since I am sure there is a desperate need in the world for yet even more ways of estimating the amount of heterogeneity in a random-effects model meta-analysis, I threw in a whole bunch of extra estimators.$\tau^2$$\tau^2$ text/html 2023-05-09T06:39:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2015?rev=1683614352 Package News for 2015 2015-11-30: Development Moved to git / GitHub Up to now, I had been using a sort of home-brewed version control system for the development of the metafor package. In the meantime, I was watching all the cool kids jump on the git / GitHub bandwagon and was really starting to feel left out. But no longer! I have finally moved development to git / GitHub, so now I am cool again, right?!? I thought so text/html 2023-05-09T06:34:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2016?rev=1683614051 Package News for 2016 2016-09-25: New Version Out (1.9-9) After fixing some issues introduced by some non-backwards compatible changes in a package that metafor makes use of in a few places, I pushed out version 1.9-9 to CRAN (see here). So this is now the official (i.e., CRAN) release. This version includes many smaller tweaks and improvements, plus a few more noteworthy ones:$I^2$ text/html 2023-05-09T06:35:02+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2017?rev=1683614102 Package News for 2017 2017-07-21: R-sig-meta-analysis Mailing List There is now a special interest group (SIG) mailing list for discussing the use of R for conducting meta-analyses at R-SIG-meta-analysis. Many questions I receive about metafor and meta-analysis in general are partly statistical, partly about programming, partly about interpreting output. Those types of questions are not well suited for the text/html 2021-11-25T09:27:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2018?rev=1637832462 Package News for 2018 2018-12-28: Devel Version ... Again Since the beginning of this year, I've made 84 commits to the 'development' version of the metafor package. Some recent additions include adding a vif() function to obtain 'variance inflation factors' to diagnose potential collinearity among the predictor variables in meta-regression models, being able to specify vectors for the text/html 2023-09-29T07:37:01+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2019?rev=1695973021 Package News for 2019 2019-07-01: Talk on the metafor Package About a month ago, I gave a talk at the Research Synthesis 2019 conference, organized by the Leibniz Institute for Psychology Information (ZPID), in Dubrovnik, Croatia. In this talk, I describe the past, present, and future of the metafor package. Although I find it extremely embarrassing to see me on video like this, you can see the talk text/html 2024-03-29T09:56:39+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2020?rev=1711706199 Package News for 2020 2020-11-14: An Aggregate Function In many meta-analyses, multiple effect size estimates or outcomes can be extracted from the same study. Ideally, such structures should be analyzed using an appropriate multilevel/multivariate model as can be fitted with the text/html 2022-08-03T11:26:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2021?rev=1659525971 Package News for 2021 2021-06-09: Version 3.0 Released on CRAN A new version of the metafor package (version 3.0) has been published on CRAN. This version includes a lot of updates that have accumulated in the development version of the package over the past 14-15 months. Some highlights:$k-p$$k$$p$$m$$k-p$$m$ text/html 2023-05-09T06:42:35+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2022?rev=1683614555 Package News for 2022 2022-10-15: Allowing $\tau^2$ to Differ Across Subgroups A while ago, I wrote up a little discussion on how comparing estimates of independent meta-analyses or subgroups here. Part of this discussion touched upon subgroup analyses and two possible approaches thereof, one where we assume that the amount of heterogeneity ($\tau^2$$\tau^2$$R^2$$k$$R^2$$k$$R^2$$\tau^2$$\tau^2$$2 \times 2$ text/html 2024-03-29T10:43:54+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2023?rev=1711709034 Package News for 2023 2023-09-27: Version 4.4-0 Released on CRAN A new version of the metafor package has been released on CRAN. Some of the more important/interesting updates to the package include: * The older (convoluted) way of setting some package options has been replaced by two functions, $\tau^2$$\tau^2$ text/html 2025-01-29T16:19:34+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:news2024?rev=1738167574 Package News for 2024 2024-03-28: Version 4.6-0 Released on CRAN A new version of the metafor package has been released on CRAN. This update occurred a bit sooner than originally planned, but there were two minor issues that flagged metafor as requiring an update as otherwise it would have been archived on CRAN, which would have led to some unpleasant consequences for other packages that depend on metafor. So an update needed to be pushed out relatively quickly.$$d = \frac{\bar{x}_1 - \bar{x… text/html 2025-01-29T15:54:20+00:00 Anonymous (anonymous@undisclosed.example.com) https://mail.metafor-project.org/doku.php/news:sidebar?rev=1738166060 ---------- Navigation * Homepage * Package News * for 2024 * for 2023 * for 2022 * for 2021 * for 2020 * for 2019 * for 2018 * for 2017 * for 2016 * for 2015 * for 2014 * Package Features * Package Update Log * To-Do List / Planned Features * Download and Installation * Documentation and Help * Analysis Examples * Plots and Figures * Tips and Notes * Contributors * FAQs * Links ---------- External Links * Wolfgang Viechtbauer * …