Meta-analyses integrate the results of multiple studies into one best estimate of the outcomes of these studies. Doing meta-analyses is one of the areas of expertise I have developed over the years. At this page you find some resources that can help you to learn how to do meta-analyses.
Free Meta Analysis Book
A free introductory book describing all the steps of a meta-analysis for beginning researchers can be found here . It is free so you can distribute it as much as you want to:
For each of the chapters of this book I have recorded a youtube video explaining how this works.
Meta Analysis with R
If you want to learn how to run meta-analyses in R, you can find a free hands-on guide here (written by Matthias Harrer, Pim Cuijpers, Toshi Furukawa and David Ebert).
We have made a large meta-analytic database available for everyone who is interested. All trials comparing psychotherapy for depression with control conditions are available. You can make your own selection of trials and run a meta-analysis directly online without any software or previous knowledge