[R-meta] effect size similarities

Viechtbauer, Wolfgang (SP) wo||g@ng@v|echtb@uer @end|ng |rom m@@@tr|chtun|ver@|ty@n|
Tue Jun 22 15:54:55 CEST 2021

Dear Patrizio,

I don't know what exactly you mean by 'binomial z value', but Hedges' g is not a 'z score'. If that were the case, then g values would have a variance of 1, which is clearly not true.


>-----Original Message-----
>From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces using r-project.org] On
>Behalf Of Patrizio E Tressoldi
>Sent: Tuesday, 22 June, 2021 15:32
>To: r-sig-meta-analysis using r-project.org
>Subject: [R-meta] effect size similarities
>Is it correct to say that a binomial z value (obtained from a k events
>out of n trials minus the chance probability) can be assimilated to an
>Hedges' g requiring no transformations for their comparison given that
>their are both z scores?
>Patrizio E. Tressoldi Ph.D.
>Science of Consciousness Research Group
>Studium Patavinum
>Università di Padova
>Padova - ITALY

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