This function is generic; method functions can be written to handle
specific classes of objects. Classes which already have methods for
this function include
corStruct,
corSpatial,
data.frame
, and
varFunc.
USAGE:
getCovariate(object, form, data)
REQUIRED ARGUMENTS:
object
any object with a
covariate component
OPTIONAL ARGUMENTS:
form
an optional one-sided formula specifying the covariate(s)
to be extracted. Defaults to
formula(object).
data
a data frame in which to evaluate the variables defined in
form.
VALUE:
will depend on the method function used; see the appropriate documentation.