model.frame {base} | R Documentation |
model.frame
(generic function) and its methods return a
data.frame
with the variables from formula
.
model.frame(formula, data, na.action, ...) model.frame.default(formula, data = sys.frame(sys.parent()), na.action, drop.unused.levels = FALSE, xlev = NULL, ...) Methods for lm glm aovlist
formula |
a model formula |
data |
data.frame , list, environment or object
coercible to data.frame containing the variables in
formula . |
na.action |
how NA s are treated. The default is first,
any na.action attribute of data , second
a na.action setting of options , and third
na.fail if that is unset. The ``factory-fresh''
default is na.omit . |
drop.unused.levels |
should factors have unused levels dropped?
Defaults to FALSE . |
xlev |
a named list of character vectors giving the full set of levels to be assumed for each factor. |
... |
further arguments such as subset , offset and
weights . NULL arguments are treated as missing. |
A data.frame
containing the variables used in
formula
.
model.matrix
for the ``design matrix''.
data(cars) data.class(model.frame(dist ~ speed, data = cars))