# 7 Meta-analyses

For running meta-analyses, we recommend the metafor package for R (see link 1, link 2).

A comprehensive, hands-on guide on how to use this package is provided in the book by Harrer and colleagues,19 freely available at this link.

An alternative to the metafor package is to Bayesian multilevel modelling (also discussed in the book by Harrer and colleagues). A more technical discussion of Bayesian multilevel modelling for meta-analyes is provided in this paper by Williams, Rast and Bürkner.20