Extract Covariate from an Object

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.

getCovariate(object, form, data)

Arguments

object

any object with a covariate component

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.

References

Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. p. 100.

Author

José Pinheiro and Douglas Bates bates@stat.wisc.edu