blup is generic. It extracts the best linear unbiased predictions (BLUPs) for specific classes of objects. BLUPs combine the fitted values based on the fixed effects in the model and the estimated contributions of the random effects.blup(x, ...)"rma.uni" created by the rma.uni function. Accordingly, the corresponding method is called blup.rma.uni. See the documentation for that function for more details.blup.rma.uni