首先，研究了在不完备信息系统下的属性约简算法。
Firstly, the attributes reduction algorithm is studied under the incomplete information systems.
在扩充粗糙集理论中，容差关系是一种处理不完备信息系统的工具。
Tolerance relation is an effective tool in patulous rough set theory to deal with incomplete information systems.
该算法无需改变初始不完备信息系统的结构，能直接处理缺省数据。
The algorithm could deal with incomplete data directly and do not required changing the size of the original incomplete system.
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