Plots a regression line on a scatterplot; the line is plotted
between the minimum and maximum x-values.
Usage
regLine(mod, col=palette()[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 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.
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.