Title: 1985 Auto Imports Database
Source Information:
-- Creator/Donor: Jeffrey C. Schlimmer (Jeffrey.Schlimmera.gp.cs.cmu.edu)
-- Date: 19 May 1987
-- Sources:
1) 1985 Model Import Car and Truck Specifications, 1985 Ward's
Automotive Yearbook.
2) Personal Auto Manuals, Insurance Services Office, 160 Water
Street, New York, NY 10038
3) Insurance Collision Report, Insurance Institute for Highway
Safety, Watergate 600, Washington, DC 20037
Past Usage:
-- Kibler,D., Aha,D.W., Albert,M. (1989). Instance-based prediction
of real-valued attributes. it Computational Intelligence, it 5,
51--57.
-- Predicted price of car using all numeric and Boolean attributes
-- Method: an instance-based learning (IBL) algorithm derived from a
localized k-nearest neighbor algorithm. Compared with a
linear regression predictionso all instances
with missing attribute values were discarded. This resulted with
a training set of 159 instances, which was also used as a test
set (minus the actual instance during testing).
-- Results: Percent Average Deviation Error of Prediction from Actual
-- 11.84 for the IBL algorithm
-- 14.12 for the resulting linear regression equation
Relevant Information:
-- Description
This data set consists of three types of entities: (a) the
specification of an auto in terms of various characteristics, (b)
its assigned insurance risk rating, (c) its normalized losses in use
as compared to other cars. The second rating corresponds to the
degree to which the auto is more risky than its price indicates.
Cars are initially assigned a risk factor symbol associated with its
price. Then, if it is more risky (or less), this symbol is
adjusted by moving it up (or down) the scale. Actuarians call this
process "symboling". A value of +3 indicates that the auto is
risky, -3 that it is probably pretty safe.
The third factor is the relative average loss payment per insured
vehicle year. This value is normalized for all autos within a
particular size classification (two-door small, station wagons,
sports/speciality, etc), and represents the average loss per car
per year.
-- Note: Several of the attributes in the database could be used as a
"class" attribute.
Number of Instances: 205
Number of Attributes: 26 total
-- 15 continuous
-- 1 integer
-- 10 nominal
Attribute Information:
Attribute: Attribute Range:
------------------ -----------------------------------------------
symboling: -3, -2, -1, 0, 1, 2, 3.
normalized-losses: continuous from 65 to 256.
make: alfa-romero, audi, bmw, chevrolet, dodge, honda,
isuzu, jaguar, mazda, mercedes-benz, mercury,
mitsubishi, nissan, peugot, plymouth, porsche,
renault, saab, subaru, toyota, volkswagen, volvo
fuel-type: diesel, gas.
aspiration: std, turbo.
num-of-doors: four, two.
body-style: hardtop, wagon, sedan, hatchback, convertible.
drive-wheels: 4wd, fwd, rwd.
engine-location: front, rear.
wheel-base: continuous from 86.6 120.9.
length: continuous from 141.1 to 208.1.
width: continuous from 60.3 to 72.3.
height: continuous from 47.8 to 59.8.
curb-weight: continuous from 1488 to 4066.
engine-type: dohc, dohcv, l, ohc, ohcf, ohcv, rotor.
num-of-cylinders: eight, five, four, six, three, twelve, two.
engine-size: continuous from 61 to 326.
fuel-system: 1bbl, 2bbl, 4bbl, idi, mfi, mpfi, spdi, spfi.
bore: continuous from 2.54 to 3.94.
stroke: continuous from 2.07 to 4.17.
compression-ratio: continuous from 7 to 23.
horsepower: continuous from 48 to 288.
peak-rpm: continuous from 4150 to 6600.
city-mpg: continuous from 13 to 49.
highway-mpg: continuous from 16 to 54.
price: continuous from 5118 to 45400.
Missing Attribute Values: (denoted by "?")
Attribute : Number of instances missing a value:
41
2
4
4
2
2
4