plot.OCcoords {oc}R Documentation

Optimal Classification Coordinate Plot

Description

plot.coords reads an Optimal Classification object in 2 user-specified dimensions and plots the coordinates of each member, applying separate colors and shapes to each party by default. A unit circle is included to emphasize the constraints on the Optimal Classification coordinates, and options to select non-party attributes of legislators are included. For a 1D OCobject object, Optimal Classification ranks are plotted against themselves, so they appear on a straight line.

Usage

plot.OCcoords(x, main.title="OC Coordinates",
    d1.title="First Dimension", d2.title="Second Dimension", dims=c(1,2),
    plotBy="party", color=TRUE, shape=TRUE, cutline=NULL, Legend=TRUE,
    legend.x=0.8, legend.y=1, ...)            

Arguments

x an OCobject output object.
main.title string, coordinate plot title.
d1.title string, x-axis label.
d2.title string, y-axis label.
dims vector of length 2, specifying the dimensions to be plotted.
plotBy string, name of a variable in OCobject\$legislators. plot.coords will plot coordinates using this variable as a selector.
color logical, marks different groups specified by plotBy using different colors if TRUE.
shape logical, marks different groups specified by plotBy using different shapes if TRUE.
cutline vector, selects roll calls by row number for which a cutting line is desired.
Legend logical, include a generic legend.
legend.x numeric, corresponds to the 'x' argument of legend().
legend.y numeric, corresponds to the 'y' argument of legend().
... other arguments to symbols.

Value

A coordinate plot.

Author(s)

Keith Poole kpoole@ucsd.edu

Jeffrey Lewis jblewis@ucla.edu

James Lo jameslo@ucla.edu

Royce Carroll rcarroll@ucsd.edu

See Also

'oc', 'plot.OCskree', 'plot.OCangles', 'plot.OCcutlines', 'plot.OCobject'

Examples

    #This data file is the same as that obtained using:
    #data(sen90)
    #sen90oc<-oc(sen90,dims=2,polarity=c(7,2)) 

    data(sen90oc)
    summary(sen90oc)
    plot.OCcoords(sen90oc)

[Package oc version 0.04 Index]