Power Mediation Analysis

Calculating the sample size needed for a mediation analysis with G*Power and with simulation results

Arndt Regorz, Dipl. Kfm. & M.Sc. Psychologie, 11/28/2020

If you want to run a mediation analysis you want to know how large your sample size will have to be to finde an indirect effect. This video tutorial shows you how to do that.


  1. Video tutorial
  2. References

1. Video tutorial

(Note: When you click on this video you are using a service offered by YouTube.)

2. References

Erdfelder, E., Faul, F., & Buchner, A. (1996). GPOWER: A general power analysis program. Behavior research methods, instruments, & computers, 28(1), 1-11. https://link.springer.com/content/pdf/10.3758/BF03203630.pdf

Fritz, M. S., & MacKinnon, D. P. (2007). Required sample size to detect the mediated effect. Psychological science, 18(3), 233-239. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2843527/

Heinrich-Heine Universität Düsseldorf. (n.d.). G*Power [Computer software]. https://www.psychologie.hhu.de/arbeitsgruppen/allgemeine-psychologie-und-arbeitspsychologie/gpower.html

Additional tutorial about mediation analysis