[R] metafor rma.mv weights questions

Duncan, Laura duncanlj at mcmaster.ca
Mon Jan 30 18:18:03 CET 2017

Hi there, 

Does the rma.mv command in metafor automically adjust the weights to account for multiple effect sizes within study or do these weights need to manually calculated and applied?

In setting up a multilevel meta-analysis and meta-regression with multiple effect sizes within studies, I have seen the suggestion to adjust the weights according to Hedges, Tipton, & Johnson (suggestion made at 24.33mins in this tutorial https://www.youtube.com/watch?v=rJjeRRf23L8) using:
 Wij=1/Kj*mean V.j
I am wondering if the data is structured hierarchically and the random effects for each level specified correctly, does the rma.mv command automatically adjust the weights in this way? Another way to ask this question is - what are the default weights used by rma.mv when there are multiple estimates within studies? 


Laura Duncan, M.A.
Research Coordinator
Offord Centre for Child Studies 
McMaster University

Tel: 905 525 9140 x21504
Fax: 905 574 6665
duncanlj at mcmaster.ca

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