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 = na.fail, ...) Methods for lm glm aovlist
formula |
a model formula |
data |
data.frame or environment where the objects
in formula are. |
na.action |
how NA s are treated. |
drop.unused.levels |
show 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 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))