Additional arguments passed to the predict_fn of the input model
output_units
Optionally specify the output units of the model as a
string, e.g., "ft^3". The provided string must be compatible with the
units::set_units() function.
newdata
A dataframe containing columns that match the names of the arguments given
to predict_ranef. The values of this data represents information from a
new group of observations for which predictions are desired (e.g., a new
stand or plot).