oc (version 0.08)

plot.OCcoords: 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.

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)