pscl (version 1.02)

dropRollCall: drop user-specified elements from a rollcall object

Description

Drop user-specified elements of rollcall object, returning a roll call object.

Usage

dropRollCall(object, dropList,debug=FALSE)

Arguments

object

an object of class rollcall

dropList

a list (or alist) with some (or all) of the following components: codes{character or numeric, possibly a vector. If character, it

debug

logical, set to TRUE to see messages printed to the console as inspection and subsetting of the rollcall object takes place

Value

• An object of class rollcall with components modified/added by the subsetting indicated in the dropList.

Details

It is often desirable to restrict the analysis of roll call data in various ways. For one thing, unanimous votes provide no information discriminating among legislators: hence, summary and analysis should almost always use dropList=list(lop=0). See the examples for other possibilities, limited only by the information supplied in legis.data and votes.data.

See Also

dropUnanimous, summary.rollcall, ideal, alist.

Examples

data(s109)
s109.working <- dropRollCall(s109,
                             dropList=list(lop=0))
summary(s109.working)

s109.working <- dropRollCall(s109,
                             dropList=list(lop=0,
                               code="notInLegis"))
summary(s109.working)

s109.working <- dropRollCall(s109,
                             dropList=list(lop=3,
                               code="notInLegis"))
summary(s109.working)

## note use of alist, since dropLegis is an expression
dropList <- alist(lop=3,
                 dropLegis=party!="D",
                 code="notInLegis")
s109.working <- dropRollCall(s109,dropList=dropList,debug=TRUE)
summary(s109.working)

s109.working <- dropRollCall(s109.working,dropList=list(legisMin=25))
summary(s109.working)


## read 102nd House from Poole web site
h102 <- readKH("ftp://voteview.ucsd.edu/dtaord/hou102kh.ord")

## drop President from roll call matrix
h102 <- dropRollCall(h102,
                     dropList=alist(dropLegis=state=="USA"))
summary(h102)