# Interaction effect of 2x2 ANOVA in meta-analysis

I want to meta-analyze the interaction effect of a 2x2 ANOVA.

(I am not talking about an interaction in the meta-regression, as in this question but about an interaction as the focal effect that should be meta-analytically summarized).

What is the best way to code the interaction effect size for a subsequent meta-analysis? (preferably in the metafor package)

• What kind of information do you have? Means, SDs, and cell sizes of all four cells? Just F-values and the degrees of freedom? Do you want a 'standardized' effect size? – Wolfgang Nov 25 '14 at 21:16
• I have both situations, as you wrote: a) Means, SDs, sample size and b) only F and dfs. "Standardized": If possible. – Felix S Nov 26 '14 at 18:48