Extracting the “Environment” of a Model Formula

Description

model.frame (generic function) and its methods return a data.frame with the variables from formula.

Usage

model.frame(formula, data, na.action, ...)
model.frame.default(formula, data=sys.frame(sys.parent()),
                    na.action = na.fail, ...)

Methods for
	lm	glm	aovlist

Arguments

Value

A data.frame containing the variables used in formula.

See Also

model.matrix for the “design matrix”.

Examples

data(cars)
data.class(model.frame(dist ~ speed, data = cars))