R: Modify Terms Objects

delete.response {base}

R Documentation

Modify Terms Objects

delete.response returns a terms object for the same model but with no response variable.

drop.terms removes variables from the right-hand side of the model.

reformulate creates a formula from a vector of strings.

delete.response(termobj)
reformulate(termlabels,response=NULL)
drop.terms(termobj, dropx = NULL, keep.response = FALSE)

`termobj`	A `terms` object
`termlabels`	vector of strings giving the right-hand side of a model formula
`response`	string giving the left-hand side of a model formula
`dropx`	vector of positions of variables to drop from the right-hand side of the model
`keep.response`	Keep the response in the resulting object?

delete.response and drop.terms return a terms object.

reformulate returns a formula.

ff <- y ~ z + x + w
tt <- terms(ff)
tt
delete.response(tt)
drop.terms(tt, 2:3, keep.response = T)
reformulate(attr(tt, "term.labels"))