I have some difficulties using metafor from R.
I am doing a prevalence meta-analysis and I used arcsine transformation. Then for the predicted values I need to use the argument transf=iarcsin to back transform to a prevalence rate. For the forest plot, I want to have also the prevalence rate according to the calculated weight corresponding to each study, but I only get the arcsine transformed value, no matter whether I use the transf argument or not, I get the same result (yi instead of prevalence rates in the forest plot).
This is the code I am using:
forest(alex1.ma, addcred = TRUE, header = TRUE, transf = "iarcsine", slab = authors, showweights = TRUE, ilab = alex1_df$css, ilab.xpos = c(-0.5))
Thanks