# reg.line

From car v1.0-18
by John Fox

##### Plot Regression Line

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

- Keywords
- aplot

##### 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.

##### 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.

##### See Also

##### Examples

```
data(Davis)
attach(Davis)
mod.M<-lm(repwt~weight, subset=sex=="M")
mod.F<-lm(repwt~weight, subset=sex=="F")
plot(weight, repwt, pch=c(1,2)[sex])
reg.line(mod.M)
reg.line(mod.F, lty=2)
```

*Documentation reproduced from package car, version 1.0-18, License: GPL version 2 or newer*

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