regLine {car}  R Documentation 
Plots a regression line on a scatterplot; the line is plotted between the minimum and maximum xvalues.
regLine(mod, col=carPalette()[2], lwd=2, lty=1,...)
mod 
a model, such as produced by 
col 
color for points and lines; the default is the second entry
in the current car palette (see 
lwd 
line width; default is 
lty 
line type; default is 
... 
optional arguments to be passed to the

In contrast to abline
, this function plots only over
the range of the observed xvalues. The xvalues are extracted from
mod
as the second column of the model matrix.
NULL
. This function is used for its side effect: adding
a line to the plot.
John Fox jfox@mcmaster.ca
plot(repwt ~ weight, pch=c(1,2)[sex], data=Davis) regLine(lm(repwt~weight, subset=sex=="M", data=Davis)) regLine(lm(repwt~weight, subset=sex=="F", data=Davis), lty=2)