[R-meta] N of trials or participants?

Viechtbauer, Wolfgang (NP) wo||g@ng@v|echtb@uer @end|ng |rom m@@@tr|chtun|ver@|ty@n|
Wed Feb 1 08:44:03 CET 2023

I think you are using 'trials' in a different way than how I interpreted it. I understood it as meaning 'studies' (as in 'clinical trials') but you seem to be referring to repeated measurements on individual subjects. Can you describe in more detail what kind of data you are thinking of?


>-----Original Message-----
>From: Patrizio E Tressoldi [mailto:patrizio.tressoldi using unipd.it]
>Sent: Wednesday, 01 February, 2023 7:58
>To: Viechtbauer, Wolfgang (NP); r-sig-meta-analysis using r-project.org
>Subject: Re: [R-meta] N of trials or participants?
>Il 31/01/2023 21:51, Viechtbauer, Wolfgang (NP)wrote:
>Dear Patrizio,
>I don't really understand your question. With 'standardized effect sizes
>estimation', do you mean the calculation of an effect size like a standardized
>mean difference? If so, that is done for a trial/study, so how would the number
>of trials ever be relevant for this?
>Yes, I mean a standardized mean difference or a difference between proportions.
>In many studies, participants' results are based on a different number of trials.
>Subject: [R-meta] N of trials or participants?
>When and how is it possible to use N of trials instead of N of
>participants in the standardized effect sizes estimation?
>It is likely that this question already had a response. In this case,
>please send me links or references.
>Patrizio E. Tressoldi Ph.D.
>Science of Consciousness Research Group
>Studium Patavinum
>Università di Padova
>Padova - ITALY
>Make war history
>support https://en.emergency.it

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