| 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
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.
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)))