auto {grpnet}

Auto MPG Data Set

Description

Miles per gallon and other characteristics of vehicles from the 1970s-1980s. A version of this dataset was used as the 1983 American Statistical Association Exposition dataset.

Usage

data("auto")

Format

A data frame with 392 observations on the following 9 variables.

mpg

miles per gallon (numeric vector)

cylinders

number of cylinders: 3,4,5,6,8 (ordered factor)

displacement

engine displacement in cubic inches (numeric vector)

horsepower

engine horsepower (integer vector)

weight

vehicle weight in of lbs. (integer vector)

acceleration

0-60 mph time in sec. (numeric vector)

model.year

ranging from 1970 to 1982 (integer vector)

origin

region of origin: American, European, Japanese (factor vector)

Details

This is a modified version of the "Auto MPG Data Set" on the UCI Machine Learning Repository, which is a modified version of the "cars" dataset on StatLib.

Compared to the version of the dataset in UCI's MLR, this version of the dataset has removed (i) the 6 rows with missing horsepower scores, and (ii) the last column giving the name of each vehicle (car.name).

Source

The dataset was originally collected by Ernesto Ramos and David Donoho.

StatLib—Datasets Archive at Carnegie Mellon University http://lib.stat.cmu.edu/datasets/cars.data

Machine Learning Repository at University of California Irvine https://archive.ics.uci.edu/ml/datasets/Auto+MPG

Examples

# load data
data(auto)

# display structure
str(auto)

# display header
head(auto)

# see 'cv.grpnet' for cross-validation examples
?cv.grpnet

# see 'grpnet' for fitting examples
?grpnet