I have some question about metafor package.
I'm interest to perform a random effect meta-analysis of proportion
(single group summary of prevalence of disease in a population as
reported by different study)
It ask:
1. "PFT": The Freeman-Tukey double arcsine transformed proportion is
reported to be equal to 1/2*(asin(sqrt(xi/(ni+1))) +
asin(sqrt((xi+1)/(ni+1)))). Hovewer, i also found the same formula but
without 1/2*.
2. how "vi", the corresponding (estimated) sampling variance is
calculated? (i.e. the formula used to estimate "vi")
3. it is possible to return a forest plot with the backtransformed
value of proportion, confidenc interval and weight and not with the
transformed value after performing rma.uni?
Many thanks
Mario Petretta
Dipartimento di Medicina Clinica Scienze Cardiovascolari e Immunologiche
Facoltà di Medicina e Chirurgia
Università di Napoli Federico II
081 - 7462233
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