R: Modify terms objects

delete.response {base}

R Documentation

Modify terms objects

Description

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.

Usage

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

Arguments

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?

Value

delete.response and drop.terms return a terms object; reformulate returns a formula.

Examples

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"))