| reg.line {car} | R Documentation |
Plots a regression line on a scatterplot; the line is plotted between the minimum and maximum x-values.
reg.line(mod, col=palette()[2], lwd=2, lty=1,...)
mod |
a model, such as produced by lm,
that responds to the coefficients function
by returning a 2-element vector, whose elements are
interpreted respectively as the
intercept and slope of a regresison line. |
col |
color for points and lines; the default is the second entry
in the current color palette (see palette
and par). |
lwd |
line width; default is 2 (see par). |
lty |
line type; default is 1, a solid line (see par). |
... |
optional arguments to be passed to the
lines plotting function. |
In contrast to abline, this function plots only over
the range of the observed x-values. The x-values 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) reg.line(lm(repwt~weight, subset=sex=="M", data=Davis)) reg.line(lm(repwt~weight, subset=sex=="F", data=Davis), lty=2)