car90: Automobile Data from 'Consumer Reports' 1990
In rpart: Recursive Partitioning and Regression Trees

car90

R Documentation

Automobile Data from 'Consumer Reports' 1990

Description

Data on 111 cars, taken from pages 235–255, 281–285 and 287–288 of the April 1990 Consumer Reports Magazine.

Usage

data(car90)

Format

The data frame contains the following columns

Country: a factor giving the country in which the car was manufactured
Disp: engine displacement in cubic inches
Disp2: engine displacement in liters
Eng.Rev: engine revolutions per mile, or engine speed at 60 mph
Front.Hd: distance between the car's head-liner and the head of a 5 ft. 9 in. front seat passenger, in inches, as measured by CU
Frt.Leg.Room: maximum front leg room, in inches, as measured by CU
Frt.Shld: front shoulder room, in inches, as measured by CU
Gear.Ratio: the overall gear ratio, high gear, for manual transmission
Gear2: the overall gear ratio, high gear, for automatic transmission
HP: net horsepower
HP.revs: the red line—the maximum safe engine speed in rpm
Height: height of car, in inches, as supplied by manufacturer
Length: overall length, in inches, as supplied by manufacturer
Luggage: luggage space
Mileage: a numeric vector of gas mileage in miles/gallon as tested by CU; contains NAs.
Model2: alternate name, if the car was sold under two labels
Price: list price with standard equipment, in dollars
Rear.Hd: distance between the car's head-liner and the head of a 5 ft 9 in. rear seat passenger, in inches, as measured by CU
Rear.Seating: rear fore-and-aft seating room, in inches, as measured by CU
RearShld: rear shoulder room, in inches, as measured by CU
Reliability: an ordered factor with levels ‘⁠Much worse⁠’ < ‘⁠worse⁠’ < ‘⁠average⁠’ < ‘⁠better⁠’ < ‘⁠Much better⁠’: contains NAs.
Rim: factor giving the rim size
Sratio.m: Number of turns of the steering wheel required for a turn of 30 foot radius, manual steering
Sratio.p: Number of turns of the steering wheel required for a turn of 30 foot radius, power steering
Steering: steering type offered: manual, power, or both
Tank: fuel refill capacity in gallons
Tires: factor giving tire size
Trans1: manual transmission, a factor with levels ‘⁠⁠’, ‘⁠man.4⁠’, ‘⁠man.5⁠’ and ‘⁠man.6⁠’
Trans2: automatic transmission, a factor with levels ‘⁠⁠’, ‘⁠auto.3⁠’, ‘⁠auto.4⁠’, and ‘⁠auto.CVT⁠’. No car is missing both the manual and automatic transmission variables, but several had both as options
Turning: the radius of the turning circle in feet
Type: a factor giving the general type of car. The levels are: ‘⁠Small⁠’, ‘⁠Sporty⁠’, ‘⁠Compact⁠’, ‘⁠Medium⁠’, ‘⁠Large⁠’, ‘⁠Van⁠’
Weight: an order statistic giving the relative weights of the cars; 1 is the lightest and 111 is the heaviest
Wheel.base: length of wheelbase, in inches, as supplied by manufacturer
Width: width of car, in inches, as supplied by manufacturer

Source

This is derived (with permission) from the data set car.all in S-PLUS, but with some further clean up of variable names and definitions.

Examples

data(car90)
plot(car90$Price/1000, car90$Weight,
     xlab = "Price (thousands)", ylab = "Weight (lbs)")
mlowess <- function(x, y, ...) {
    keep <- !(is.na(x) | is.na(y))
    lowess(x[keep], y[keep], ...)
}
with(car90, lines(mlowess(Price/1000, Weight, f = 0.5)))

rpart documentation built on May 29, 2024, 8:38 a.m.