plot.cutlines: W-NOMINATE Cutline Plot

Description

plot.cutlines reads a W-NOMINATE object and plots the cutting line of a specified proportion of all votes along two user-specified dimensions. The default is to plot 50 cutting lines. This is also known as a Coombs mesh. A unit circle is included to emphasize the constraints on the W-NOMINATE coordinates. Only cutlines that are constrained to have midpoints lying in a unit circle are included. plot.cutlines does not work for 1D W-NOMINATE objects.

Usage

# S3 method for cutlines
plot(x, main.title="Cutting Lines",
        d1.title="First Dimension", d2.title="Second Dimension",
        lines=50,dims=c(1,2),lwd=2,...)

Value

A Coombs mesh.

Arguments

x: a wnominate output object.
main.title: string, coordinate plot title.
d1.title: string, x-axis label.
d2.title: string, y-axis label.
lines: numeric, number of non-constrained cutlines to be plotted. If this number exceeds to total number of cutlines, then all cutlines are plotted.
dims: numeric vector of length 2, specifying dimensions to be plotted.
lwd: numeric, line width.
...: other arguments to symbols.

Author

Keith Poole ktpoole@uga.edu

Jeffrey Lewis jblewis@ucla.edu

James Lo lojames@usc.edu

Royce Carroll rcarroll@rice.edu

Examples

Run this code

    #This data file is the same as that obtained using:
    #data(sen90)
    #sen90wnom<-wnominate(sen90,polarity=c(2,5))
    data(sen90wnom)

    summary(sen90wnom)
    plot.cutlines(sen90wnom)
    plot(sen90wnom)