关键词: 区间值信息系统, 相似度, 相似率, 双精度容差关系, 属性约简

Abstract: In order to deal with the general interval-valued information system, this paper provides the definition of similarity which is based on deviation degree, gives the dual-variables precision tolerance relation which is based on similarity and similar rate, discusses the attribute reduction and judgment of interval-valued information system in the condition of dual-variables precision tolerance relation, gives a new attribute reduction algorithm which is based on the binary discerni-bility matrix, and at the same time discusses the effect of similarity and similar rate to the attribute reduction. The example shows the specific operation method of attribute reduction and the effective feasibility of algorithm.

Key words: interval-valued information system, similarity, similar rate, dual-variables precision tolerance relation, attribute reduction