The predictions for the linear model represented by
object are
obtained at the covariate values defined in
newdata.
USAGE:
predict(object, newdata, na.action)
REQUIRED ARGUMENTS:
object
an object inheriting from class
gls, representing
a generalized least squares fitted linear model.
OPTIONAL ARGUMENTS:
newdata
an optional data frame to be used for obtaining the
predictions. All variables used in the linear model must be present
in the data frame. If missing, the fitted values are returned.
na.action
a function that indicates what should happen when
newdata contains
NAs. The default action
(
na.fail) causes the function to print an error message and
terminate if there are any incomplete observations.