Automobile Data from Consumer Reports
SUMMARY:
Three data frames,
cu.summary
,
cu.dimensions
, and
cu.specs
,
give information on makes of cars taken from the April, 1990 issue of Consumer
Reports. Three further data frames,
car.all
,
car.test.frame
, and
fuel.frame
, combine information
from the first three.
This data frame contains data on 5 variables (columns) for 117 cars (rows).
It is a summary of the information on pages 235-255 of the magazine.
ARGUMENTS:
- Price
-
numeric vector of list price with standard equipment, in dollars.
- Country
-
a factor giving the country in which the car was manufactured.
The levels are:
Brazil
,
England
,
France
,
Germany
,
Japan
,
Japan/USA
,
Korea
,
Mexico
,
Sweden
,
USA
.
- Reliability
-
an ordered factor; ` Much worse < worse < average < better < Much
better; contains
NA
s.
- Mileage
-
a numeric vector of gas mileage in miles/gallon as tested by CU;
contains
NA
s.
- Type
-
a factor giving the general type of car. The levels are:
Small
,
Sporty
,
Compact
,
Medium
,
Large
,
Van
.
`cu.dimensions' :
This data frame contains numeric vectors with data for each of 11
variables (columns) for 111 cars.
This is the table on pages 287-288 of Consumer Reports, April, 1990.
ARGUMENTS:
- Length
-
overall length, in inches, as supplied by manufacturer.
- Wheel.base
-
length of wheelbase, in inches, as supplied by manufacturer.
- Width
-
width of car, in inches, as supplied by manufacturer.
- Height
-
height of car, in inches, as supplied by manufacturer.
- 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.
- 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.
- Frt.Leg.Room
-
maximum front leg room, in inches, as measured by CU.
- Rear.Seating
-
rear fore-and-aft seating room, in inches, as measured by CU.
- Frt.Shld
-
front shoulder room, in inches, as measured by CU.
- RearShld
-
rear shoulder room, in inches, as measured by CU.
- Luggage
-
`cu.specs' :
This data frame contains the data on 20 mechanical specifications for 137 cars.
This is essentially the table on pages 281-285 of the magazine.
ARGUMENTS:
- Weight
-
an order statistic giving the relative weights of the cars; 1 is the
lightest and 111 is the heaviest.
- Tires
-
factor giving tire size. Possible options are:
195/60 155/80 165/80 175/70 145 145/80 165/65 155/65 155 215/65 275/40
185/70 205/60 205/55 195/75 225/60 185/60 225/50 195/65 215/50
195/50 185/80 215/60 195/70 185/65 185/75 205/70 205/65 215/70 205/75
225/75 185.
- Steering
-
factor giving the number of turns of the steering wheel required for
a turn of 30 foot radius. All the cars for which this is given have
manual steering. The range is
0.68
to
0.82
.
- Turning
-
a factor giving the radius of the turning circle in feet.
- Disp.
-
a numeric vector giving the engine displacement in liters.
- HP
-
a factor giving the net horsepower.
- Trans1
-
a factor giving the type of transmission (
man.
= manual,
P
= power)
and number of gears. The levels are
man.5
man.4
and
man.6
.
- Gear.Ratio
-
a numeric vector giving the overall gear ratio, high gear.
- Eng.Rev
-
engine revolutions per mile, or engine speed at 60 mph.
- Tank
-
fuel refill capacity in gallons.
- Disp2
-
engine displacement in liters.
- HP.revs
-
the red line---the maximum safe engine speed in rpm.
`cars.all' :
This data frame contains data on all 36 variables from the three
data frames above for the makes of cars which have data in all three
data frames. The cars' names (row names) have been sorted and
edited slightly.
This data frame contains the variables
Price
,
Country
,
Reliability
,
Mileage
, Disp., and
Type
from
cu.summary
,
Weight
, the weight of the car in pounds, and
HP
from
cu.specs
for the 60 cars which have data for
Mileage
.
This data frame contains
Weight
, the weight of the car in pounds,
the variables
Disp.
and
Type
from
cu.summary
,
Mileage
from
cu.specs
, and the added, calculated variable
Fuel
for the same
60 cars as
car.test.frame
.
Consumer Reports, April, 1990, pp. 235-288 quoted in
John M. Chambers and Trevor J. Hastie, (eds.) Statistical Models in S,
Wadsworth and Brooks, Pacific Grove, CA 1992, pp. 46--47.
EXAMPLES:
# linear fit to data in fuel.frame
fuel.fit <- lm(Fuel ~ Weight + Disp., fuel.frame)
plot(fuel.fit)