[R-meta] formula of variance of mean effect from a RE model with 1/vi with weights

[Yefeng Yang]

Dear experts,
I see the rma() in metafor package can run a random-effects meta-analysis with inverse sampling variance (say vi) as weights (setting weights = 1/vi). I wonder about the formula used to calculate the variance (or standard error) of the overall mean in this model. I would be grateful if someone can provide the corresponding estimator.


Best
Yefeng Yang PhD
UNSW, Sydney


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