[R-meta] Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two?
Viechtbauer, Wolfgang (SP)
wolfg@ng@viechtb@uer @ending from m@@@trichtuniver@ity@nl
Thu Nov 8 19:59:52 CET 2018
What kind of effect size measure would you compute based on this? And what would be the corresponding sampling variance?
Best,
Wolfgang
-----Original Message-----
From: Patrizio Tressoldi [mailto:patrizio.tressoldi using unipd.it]
Sent: Thursday, 08 November, 2018 19:01
To: Viechtbauer, Wolfgang (SP); Michael Dewey; r-sig-meta-analysis using r-project.org
Subject: Re: [R-meta] Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two?
Il 08/11/2018 16:31, Viechtbauer, Wolfgang (SP) ha scritto:
> I wonder what effect size / oucome measure can sensibly be computed based on two subjects. For example, for measures based on two groups (e.g., raw or standardized mean difference, risk difference, log risk/odds ratios), this would imply that there is a single subject in each group.
>
>
Precisely.
In this specific case, two single participants contributed to a
percentage of hits, e.g. .30 and .40
I expect that the sample estimation is quite poor, but I don't see any
impediment on obtaining an effect size, or not?
Best
Patrizio
--
Patrizio E. Tressoldi Ph.D.
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Università di Padova
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