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...category of the moderator variable? Take the reliablity generalization as an example. Here is an example of my code. #meta-analysis using transformed alpha values (using the transformation suggested by Bonett, 2002) res<-rma(measure="ABT", ai=ai, ni=size, mi=n_items, dat=data) res backtransf_res<-predict(res, transf=transf.iabt) backtransf_res #meta-regression of categorical variables #take var1 as an example of categorical moderator variable res_var1<-rma(measure="ABT", ai=ai, ni=size, mi=n_items, mods=~var1, dat=data) res_var1 transf_res_var1<-predict(res_var1,newmods...