extractRollCallObject: return the roll call object used in fitting an ideal model
Description
Given a fitted model of class ideal, return the
rollcall object that was used in the model fitting
(i.e., apply all subsetting and recoding implied by the dropList
passed to ideal).
This function is used by many post-estimation commands that operate on
objects of class ideal. The function inspects the
call attribute of the
ideal object, extracting the name of the
rollcall object and the dropList, then hands them
over to dropRollCall.
See Also
rollcall; see dropRollCall for
details on the form of a dropList.
data(s109)
f = system.file("extdata","id1.rda",package="pscl")
load(f)
tmp <- extractRollCallObject(id1)
summary(tmp)
v <- convertCodes(tmp) ## roll call matrix per se