Extracting the ``Environment'' of a Model 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

formula a model formula
data data.frame or environment where the objects in formula are.
na.action how NAs are treated.
... further arguments such as.......

Description

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

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))

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