Panel Function for Coplots

a panel function for use with coplot that plots points, a lowess line, and a regression line.

panel.car(x, y, col, pch, cex=1, span=0.5, lwd=2, 
  reg.line=lm, lowess.line=TRUE, ...)

Arguments

x: vector giving horizontal coordinates.
y: vector giving vertical coordinates.
col: point color.
pch: plotting character for points.
cex: character expansion factor for points.
span: span for lowess smoother.
lwd: line width, default is 2.
reg.line: function to compute coefficients of regression line, or FALSE for no line.
lowess.line: if TRUE plot lowess smooth.
...: other arguments to pass to functions lines and regLine.

NULL. This function is used for its side effect: producing a panel in a coplot.

coplot(prestige ~ income|education, panel=panel.car, 
  col="red", data=Prestige)