| cars {base} | R Documentation |
Stopping Distances of Cars
Description
The data give the speed of cars and the distances taken to stop. Note that the data were recorded in the 1920s.
Usage
data(cars)Format
A data frame with 50 observations on 2 variables.
| [,1] | speed | numeric | Speed (mph) |
| [,2] | dist | numeric | Stopping distance (ft) |
Source
Ezekiel, M. (1930) Methods of Correlation Analysis. Wiley.
References
McNeil, D. R. (1977) Interactive Data Analysis. Wiley.
Examples
data(cars)
plot(cars, xlab = "Speed (mph)", ylab = "Stopping distance (ft)",
las = 1)
lines(lowess(cars$speed, cars$dist, f = 2/3, iter = 3), col = "red")
title(main = "cars data")
plot(cars, xlab = "Speed (mph)", ylab = "Stopping distance (ft)",
las = 1, log = "xy")
title(main = "cars data (logarithmic scales)")
lines(lowess(cars$speed, cars$dist, f = 2/3, iter = 3), col = "red")
summary(fm1 <- lm(log(dist) ~ log(speed), data = cars))
opar <- par(mfrow = c(2, 2), oma = c(0, 0, 1.1, 0),
mar = c(4.1, 4.1, 2.1, 1.1))
plot(fm1)
par(opar)