[R-meta] Weighted r values in a meta-analysis
Dear Oliver Not sure if I understand exactly what happened here but the variance of a z-transformed r value is (n-3)^-1 so the weight is (n-3). Is that what they did?
On 14/08/2017 16:14, Oliver Clark wrote:
Hi all, I was wondering if anyone could think of a situation in which individual Pearson?s Rho values would be weighted by sample size in a meta-analysis? If so, what the equation for doing so would be? I am trying to reproduce a published meta-analysis and rw[i] values are given, but the equation and justification are not. My guess was (r[i] * n[i]) / (mean(n[k]) but the numbers were different, and in fact gave r > 1. Many thanks! Oliver
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