[R] interpreting weight in meta-analysis of proportion

[petretta at unina.it]

Dear all,

I use R 3.0 for Windows.

I performed a meta-analysis of the prevalence (single proportion)  
reported in 14 different studyes using the command:

res<-metaprop(case,n,sm="PFT", comb.fixed=FALSE, comb.random=TRUE,  
studlab<- paste(Study))

print(res)

A referee ask a brief explanation of the W-statistic reported in the  
results, in particular, why the summ of the individual weights of all  
the studies is 100%.

Any suggestion is welcome.


-- 
Mario Petretta
Department of Translational Medical Sciences
Naples University Federico II
Italy