car (version 1.2-10)

reg.line: Plot Regression Line

Description

Plots a regression line on a scatterplot; the line is plotted between the minimum and maximum x-values.

Usage

reg.line(mod, col=palette()[2], lwd=2, lty=1,...)

Arguments

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.

Value

  • NULL. This function is used for its side effect: adding a line to the plot.

Details

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.

See Also

abline, lines

Examples

Run this code
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)

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