# NOT RUN {
### meta-analysis of the log risk ratios using a mixed-effects meta-regression model
### with multiple moderators (absolute latitude, publication year, and allocation method)
res <- rma(measure="RR", ai=tpos, bi=tneg, ci=cpos, di=cneg,
mods = ~ ablat + year + alloc, data=dat.bcg)
model.matrix(res)
# }
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