Extract components from a model frame

Usage

model.extract(frame, component)
model.offset(frame)
model.response(frame)

Arguments

frame A model frame
component The name of a components to extract, such as "weights", "subset"

Description

Returns the response, offset, subset, weights or other special components of a model frame passed as optional arguments to model.frame. model.offset and model.response are equivalent to model.frame(,"offset") and model.frame(,"response") respectively.

Value

The specified component of the model frame, usually a vector.

See Also

model.frame, offset

Examples

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

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