【Key words】 rough set theory； attribute reduction； data mining； incomplete information system； multivalued information system；
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基于这种思想，本文的工作首先是引入了集值信息系统以及在信息系统上进行知识发现的工具——包含度。
Based on this idea, in this paper the sets information system and inclusion degree, the tool of knowledge discovering in the information system had been introduced in firstly.
本文研究应用粗集理论对实值信息系统属性进行约简的方法。
In this paper, we study the problem of rules reduction for real value information systems by using of rough set theory.
最后，基于两种关系从集值决策信息系统提取了最优广义决策规则，并进行了讨论。
Then we give the judgment theorems and the discernibility matrices of the generalized decision reduction in set-valued decision i…
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