Meta-Analysis Resources

Tools for Those Who Summarize the Evidence Base

Resources and networking for those who conduct or interpret meta-analyses related to any phenomenon that is gauged in multiple studies.

Calculation of a priori and post hoc power

I am conducting  meta-analysis for the first time. I have read that it is important to calculate power a priori to determine the minimum number of studies that should be included in the meta-analysis, as well as post hoc to check that there was enough power to detect an effect (I am assuming there is only a need to do this in the case of a non-significant finding).

I am using a random-effects model and have been doing the calculations manually. However, I would like to check that my calculations are correct.

Does anyone know of an online (or downloadable) power calculator for meta-analysis? I have been unable to find one by searching the web so any help would be greatly appreciated.

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