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Thread: Meta-Analyis (Hedges & Olkin) - Averaging the raw correlation or averaging fishers-z?

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    Meta-Analyis (Hedges & Olkin) - Averaging the raw correlation or averaging fishers-z?




    Hello all,

    I am working on a meta-analyis and according to the book of Borenstein (2009), when a study reports more than one outcome (i.e. Return on Asset & Return on Sales), the composite effect size is basically calculated as the arithmetic mean.

    However, as this method uses a fishers-z transformation as effect size, I am not sure whether I have to average the raw correlations or the already transformed fisher-z effect sizes have to be averaged.

    Basically, the question is, whether Y (P. 16/31) should already consists of transformed (fishers-z) raw correlation, or the average raw correlations have to be fisher-z-transformed afterwards

    => Book-Chapter I am referring to:

    https://www.meta-analysis.com/downlo...20outcomes.pdf

    Somehow, I cant find an answer,

    I am thankful for any help you can provide.

    Kind regards,

    Feal.
    Last edited by Feal; 07-16-2016 at 06:11 AM. Reason: meta-analyis meta analyis fisher-z

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    Re: Meta-Analyis (Hedges & Olkin) - Averaging the raw correlation or averaging fisher

    Hi!

    No one any suggestions? Or hints?

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    Re: Meta-Analyis (Hedges & Olkin) - Averaging the raw correlation or averaging fisher


    Can you find a publication that uses the same variable in a metaanalysis?
    Stop cowardice, ban guns!

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