原文：

Car Evaluation Data Set

Derived from simple hierarchical decision model, this database may be useful for testing constructive induction and structure discovery methods.

Data Set Information:

Car Evaluation Database was derived from a simple hierarchical decision model originally developed for the demonstration of DEX, M. Bohanec, V. Rajkovic: Expert system for decision making. Sistemica 1(1), pp. 145-157, 1990.). The model evaluates cars according to the following concept structure:

CAR car acceptability

. PRICE overall price

. . buying buying price

. . maint price of the maintenance

. TECH technical characteristics

. . COMFORT comfort

. . . doors number of doors

. . . persons capacity in terms of persons to carry

. . . lug_boot the size of luggage boot

. . safety estimated safety of the car

Input attributes are printed in lowercase. Besides the target concept (CAR), the model includes three intermediate concepts: PRICE, TECH, COMFORT. Every concept is in the original model related to its lower level descendants by a set of examples .

The Car Evaluation Database contains examples with the structural information removed, i.e., directly relates CAR to the six input attributes: buying, maint, doors, persons, lug_boot, safety.

Because of known underlying concept structure, this database may be particularly useful for testing constructive induction and structure discovery methods.

Attribute Information:

Class Values:

unacc, acc, good, vgood

Attributes:

buying: vhigh, high, med, low.

maint: vhigh, high, med, low.

doors: 2, 3, 4, 5more.

persons: 2, 4, more.

lug_boot: small, med, big.

safety: low, med, high.

译：

汽车评估数据集

该数据库源于简单的分层决策模型，可用于测试构造性归纳和结构发现方法。

数据集信息：

汽车评估数据库源自一个简单的分层决策模型，最初是为DEX、M.Bohanec、V.Rajkovic：决策专家系统的演示而开发的。Sistemica 1（1），第145-157页，1990年）。该模型根据以下概念结构评估汽车：

汽车可接受性

.价格和总价格

…买入价

…维护的维护价格

.技术和技术特征

舒适，舒适

…门数量

…人员承载能力

…凸耳_boot行李箱大小

…安全性：估计的汽车安全性

输入属性以小写形式打印。除了目标概念（汽车），该模型还包括三个中间概念：价格、技术和舒适度。每个概念都在原始模型中，通过一组示例与其较低级别的后代相关。

汽车评估数据库包含删除了结构信息的示例，即汽车与六个输入属性直接相关：购买、维护、车门、人员、行李箱、安全。

由于已知的基础概念结构，该数据库对于测试构造归纳和结构发现方法可能特别有用。

属性信息：

类值：

UNC、acc、good、vgood

属性：

购买：高、高、中、低。

维护：高、高、中、低。

门：2、3、4、5或更多。

人数：2人、4人或更多。

lug_boot：小、中、大。

安全性：低、中、高。

数据示例：

vhigh,vhigh,2,2,small,low,unacc
vhigh,vhigh,2,2,small,med,unacc
vhigh,vhigh,2,2,small,high,unacc
vhigh,vhigh,2,2,med,low,unacc
vhigh,vhigh,2,2,med,med,unacc
vhigh,vhigh,2,2,med,high,unacc
vhigh,vhigh,2,2,big,low,unacc
vhigh,vhigh,2,2,big,med,unacc
vhigh,vhigh,2,2,big,high,unacc
vhigh,vhigh,2,4,small,low,unacc
vhigh,vhigh,2,4,small,med,unacc
vhigh,vhigh,2,4,small,high,unacc
vhigh,vhigh,2,4,med,low,unacc
vhigh,vhigh,2,4,med,med,unacc
vhigh,vhigh,2,4,med,high,unacc
vhigh,vhigh,2,4,big,low,unacc
vhigh,vhigh,2,4,big,med,unacc
vhigh,vhigh,2,4,big,high,unacc
vhigh,vhigh,2,more,small,low,unacc
vhigh,vhigh,2,more,small,med,unacc
vhigh,vhigh,2,more,small,high,unacc
vhigh,vhigh,2,more,med,low,unacc
vhigh,vhigh,2,more,med,med,unacc
vhigh,vhigh,2,more,med,high,unacc
vhigh,vhigh,2,more,big,low,unacc
vhigh,vhigh,2,more,big,med,unacc
vhigh,vhigh,2,more,big,high,unacc
vhigh,vhigh,3,2,small,low,unacc
vhigh,vhigh,3,2,small,med,unacc