R: Automobile Data from 'Consumer Reports' 1990

car90 {rpart} | 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 `NA`s.

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.

### See Also

`car.test.frame`, `cu.summary` for extracts from other versions of the dataset.

### 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)))

[Package rpart version 4.1-15 Index]