关键词: 粗糙集, 决策系统, 属性约简, 约简准则

Abstract: In the process of attribute reduction in decision system, reduction criterion reflects the characteristic of remaining particular information discernibility, but different types of reduction criterion may possess the same essence. Aiming at many common reduction criterions with different description form, their basic characteristic and essential nature are studied in detail, and be classified in hierarchical structure. The study result establishes a theoretical foundation for efficient reduction algorithm oriented to different reduction criterion.

Key words: rough set, decision system, attribute reduction, reduction criterion