【摘要】 粗糙集理论在数据挖掘中的成功应用已成为近来研究的热点,人们将经典粗糙集中的等价关系放宽后使粗糙集理论的运用更加广泛,但在不完备信息系统中的运用仍受到了限制。论文在文犤1犦的基础上利用集对联系度定义了不完备信息系统中集合的上、下近似运算,并得到比文犤1犦定义的近似运算更为完善的一些基本性质;通过实例说明了这种方法是可行的,在一定程度上将粗集用于研究不完备信息系统方面进行了推广。更多还原

【Abstract】 Rough Set Theory has become a focus subject because of its applications to Data Mining necessarily.But it is restricted in incomplete information systems.Based on paper1,ideas of set Pair Analysis(SPA)applied,the upper ap-proximation and the lower approximation of set in a complete information system are defined whose some better proper-ties are obtained than paper.By an example,it is verified that this method is more feasible and rough set theory is extended in some way.更多还原