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Extracting the ``Environment'' of a Model Formula
Syntax
model.frame(formula, data, na.action, ...)
model.frame.default(formula, data=sys.frame(sys.parent()),
na.action=na.fail, ...)
Arguments
formula
|
a model formula
|
data
|
data.frame or environment where the objects in
formula are.
|
na.action
|
how NA s are treated.
|
...
|
further arguments such as.......
|
Description
model.frame
is a generic function, and model.frame.default
its
default method.
Value
A data.frame
containing the variables used in formula
.
See Also
model.frame.lm
for the method used in lm
.
Examples
data(cars)
data.class(model.frame(dist ~ speed, data =cars))