# regLine

##### Plot Regression Line

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

- Keywords
- aplot

##### 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.

##### See Also

##### Examples

```
# NOT RUN {
plot(repwt ~ weight, pch=c(1,2)[sex], data=Davis)
regLine(lm(repwt~weight, subset=sex=="M", data=Davis))
regLine(lm(repwt~weight, subset=sex=="F", data=Davis), lty=2)
# }
```

*Documentation reproduced from package car, version 2.1-6, License: GPL (>= 2)*