{ "data_id": "40975", "name": "car", "exact_name": "car", "version": 3, "version_label": "3", "description": "**Author**: Marko Bohanec, Blaz Zupan \n**Source**: [UCI](https:\/\/archive.ics.uci.edu\/ml\/datasets\/car+evaluation) - 1997 \n**Please cite**: [UCI](http:\/\/archive.ics.uci.edu\/ml\/citation_policy.html) \n\n**Car Evaluation Database** \nThis 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.).\n\nThe model evaluates cars according to the following concept structure:\n \n CAR car acceptability\n . PRICE overall price\n . . buying buying price\n . . maint price of the maintenance\n . TECH technical characteristics\n . . COMFORT comfort\n . . . doors number of doors\n . . . persons capacity in terms of persons to carry\n . . . lug_boot the size of luggage boot\n . . safety estimated safety of the car\n \nInput 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 (for\nthese examples sets see http:\/\/www-ai.ijs.si\/BlazZupan\/car.html).\n \nThe 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.\n\n### Changes with respect to car (1)\n\nThe ordinal variables are stored as ordered factors in this version. \n\n### Relevant papers: \nM. Bohanec and V. Rajkovic: Knowledge acquisition and explanation for multi-attribute decision making. In 8th Intl Workshop on Expert Systems and their Applications, Avignon, France. pages 59-78, 1988. \n\nM. Bohanec, V. Rajkovic: Expert system for decision making. 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