regLine {car} R Documentation

## Plot Regression Line

### Description

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

### Usage

regLine(mod, col=carPalette()[2], lwd=2, lty=1,...)


### Arguments

 mod a model, such as produced by lm, that responds to the coef 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 car palette (see carPalette 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.

### 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.

### Value

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

### Author(s)

John Fox jfox@mcmaster.ca

abline, lines
plot(repwt ~ weight, pch=c(1,2)[sex], data=Davis)