data(cars)
A data frame with 50 observations on 2 variable.
| [,1] | speed | numeric | Speed (mph) |
| [,2] | dist | numeric | Stopping distance (ft) |
The data give the speed of cars and the distances taken to stop. Note that the data were recorded in the 1920s.
Ezekiel, M. (1930). Methods of Correlation Analysis. Wiley.
McNeil, D. R. (1977). Interactive Data Analysis. Wiley.