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[R-meta] Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two?

Wolfgang Viechtbauer 
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.

Best,
Wolfgang

-----Original Message-----
From: R-sig-meta-analysis [mailto:r-sig-meta-analysis-bounces at r-project.org] On Behalf Of Patrizio Tressoldi
Sent: Friday, 02 November, 2018 15:19
To: Michael Dewey; r-sig-meta-analysis at r-project.org
Subject: Re: [R-meta] Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two?

In this case the reviewer referred to the calculation of the effect size
of an individual primary study.

Patrizio

Il 02/11/2018 13:33, Michael Dewey ha scritto:

Thread (12 messages)

Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 2 Michael Dewey Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 2 Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 2 Wolfgang Viechtbauer Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 8 Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 8 Wolfgang Viechtbauer Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 8 Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 8 Wolfgang Viechtbauer Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 9 Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 9 Wolfgang Viechtbauer Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 9 Patrizio E Tressoldi Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 9 Wolfgang Viechtbauer Random-effects meta-analyses with inverse-variance weights cannot include studies with sample sizes of two? Nov 16