[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 17:23:54 CEST 2021

That is just a simple z-test of a single binomial proportion. This cannot be turned into a standardized mean difference (Cohen's d / Hedges' g value) or vice-versa.


>-----Original Message-----
>From: Patrizio E Tressoldi [mailto:patrizio.tressoldi using unipd.it]
>Sent: Tuesday, 22 June, 2021 16:01
>To: Viechtbauer, Wolfgang (SP); r-sig-meta-analysis using r-project.org
>Subject: Re: [R-meta] effect size similarities
>Il 22/06/2021 15:54, Viechtbauer, Wolfgang (SP) ha scritto:
>> 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.
>Here you can see the formula:
>Given you said they are different, how they must be transformed for
>their comparison?

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