| model.extract {base} | R Documentation |
Returns the response, offset, subset, weights or other
special components of a model frame passed as optional arguments to
model.frame.
model.extract(frame, component) model.offset(frame) model.response(frame)
frame |
A model frame |
component |
The name of a components to extract, such as
"weights", "subset" |
model.offset and
model.response are equivalent to model.frame(,"offset")
and model.frame(,"response") respectively.
The specified component of the model frame, usually a vector.
data(esoph)
a <- model.frame(cbind(ncases,ncontrols) ~ agegp+tobgp+alcgp,data=esoph)
model.extract(a,"response")
all(model.extract(a,"response") == model.response(a))
a <- model.frame(ncases/(ncases+ncontrols) ~ agegp+tobgp+alcgp,
data = esoph, weights = ncases+ncontrols)
model.response(a)
model.extract(a,"weights")
a <- model.frame(cbind(ncases,ncontrols) ~ agegp,
something = tobgp, data = esoph)
names(a)
all(model.extract(a,"something")==esoph$tobgp) # TRUE