[R] Mean effect size in meta-analysis using Metafor

Michael Dewey lists at dewey.myzen.co.uk
Sat Dec 12 17:12:58 CET 2015


Dear Carlijn

I wonder whether

http://www.metafor-project.org/doku.php/tips:comp_two_independent_estimates

answers your question? If you had given us an example of your fitting 
procedure we might know for sure.


On 12/12/2015 15:35, Carlijn . wrote:
>
>
> Hi all,
>
>
>
> I have a question about doing a meta-analysis, in particular a three-level
> meta-analysis using Metafor.
>
> I have estimated the mean overall effect size of males by using two different
> ways:
>
> 1. moderator analysis (male = 0, female = 1) using the whole data set
>
> 2. intercept-only model with a subset of the data (only males)
>
>
>
> The mean effect size estimated by using the categorical moderator analysis
> (1) differs considerably from the overall mean effect size estimated in an
> intercept-only model using a subset of the data (2).
>
>
>
> Can someone explain this? Which method gives a better estimation of the
> effect?
>
>
>
> Thank you in advance!
>
>   		 	   		
> 	[[alternative HTML version deleted]]
>
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html



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