Section 2 Example Data

2.1 Data: mtcars

The data was extracted from the 1974 Motor Trend US magazine, and comprises fuel consumption and 10 aspects of automobile design and performance for 32 automobiles (1973–74 models).

• You can download the data as a Microsoft Excel data file and convert it to a Comma Separate Values (.csv) file: cars.xlsx.

• Alternatively, you can download the data as a Comma Separate Values (.csv) file: cars.csv.

A data frame with 32 observations on 11 variables.

[, 1] mpg : Miles/(US) gallon

[, 2] cyl : Number of cylinders

[, 3] disp : Displacement (cu.in.)

[, 4] hp : Gross horsepower

[, 5] drat : Rear axle ratio

[, 6] wt : Weight (1000 lbs)

[, 7] qsec : 1/4 mile time

[, 8] vs : V/S (engine configuration, 0 = V; 1 = Straight)

[, 9] am : Transmission (0 = automatic, 1 = manual)

[,10] gear : Number of forward gears

[,11] carb : Number of carburetors