Extract Names from a formula
Usage
Names(object, data, exclude)
Arguments
object
|
an object inheriting from class formula .
|
data
|
an optional data frame containing the variables specified
in object . By default the variables are taken from the
environment from which Names.formula is called.
|
exclude
|
an optional character vector with names to be excluded
from the returned value. Default is c("pi",".") .
|
Description
This method function returns the names of the terms corresponding to
the right hand side of object
(treated as a linear formula),
obtained as the column names of the corresponding
model.matrix
.Value
a character vector with the column names of the model.matrix
corresponding to the right hand side of object
which are not
listed in excluded
.Author(s)
Jose Pinheiro and Douglas BatesSee Also
model.matrix
, terms
,
Names
Examples
data(Orthodont)
Names(distance ~ Sex * age, data = Orthodont)