forest is generic. It can be used to create forest plots.forest(x, ...)"rma" or a vector with the observed effect size or outcomes. See x is a fitted model object coming from the rma.uni, rma.mh, or rma.peto functions. The corresponding method is then forest.rma.
Alternatively, object x can be a vector with observed effect size or outcomes. The corresponding method is then forest.default.forest.rma, forest.default