# ggplot Fit Line and Lattice Fit Line in R

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Let’s add a fit line to a scatterplot!

### Fit Line in Base Graphics

Here’s how to do it in **base** graphics:

ols <- lm(Temp ~ Solar.R, data = airquality) summary(ols) plot(Temp ~ Solar.R, data = airquality) abline(ols)

Fit line in base graphics in R |

### Fit Line in ggplot

And here's how to do it in

**ggplot**:library(ggplot2) ggplot(data = airquality, aes(Solar.R, Temp)) + geom_point(pch = 19) + geom_abline(intercept = ols$coefficients[1], slope = ols$coefficients[2])

You can access the info from your regression results through ols$coefficients.

Fit line in ggplot in R |

### Fit Line in Lattice

In

**lattice**, it's even easier. You don't even need to run a regression; you can just add to the*type*option.library(lattice) xyplot(Temp ~ Solar.R, data = airquality, type = c("p", "r"))

Fit Line in Lattice in R |

The code is available in a gist.

### References

To

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