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决策树是用二叉树形图来表示处理逻辑的一种工具。可以直观、清晰地表达加工的逻辑要求。特别适合于判断因素比较少、逻辑组合关系不复杂的情况。

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*									       *
*  Copyright J.R. Quinlan, 1987, 1988, 1989, 1990, 1991, 1992.  This software  *
*  may not be distributed in any form without permission of the copyright      *
*  holder.								       *
*									       *
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THIS SOFTWARE IS DISTRIBUTED "AS IS", WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

THE ENTIRE RISK AS TO QUALITY, PERFORMANCE, OR RESULTS DUE TO USE OF THE
SOFTWARE IS ASSUMED BY THE USER, AND THE SOFTWARE IS PROVIDED WITHOUT
SUPPORT OR OBLIGATION OF ANY KIND TO ASSIST IN ITS USE, MODIFICATION, OR
ENHANCEMENT.