摘要： 针对带“ ”值的不完备信息系统，在对已有扩充粗糙集模型分析的基础上，对属性集合进行分类，定义各类别属性的比重和属性集的贡献度，提出一种基于属性贡献度的不可区分关系。实例分析说明，该关系在某些特殊情况下可等价于已有的扩充粗糙集模型，基于该不可区分关系的扩充粗糙集模型更灵活合理。

关键词: 不完备信息系统, 粗糙集, 不可区分关系, 相容关系, 相似关系

Abstract: Aiming at the incomplete information system with “ ”, based on analysis of some extended rough set models, this paper classifies attribute set. The proportions of each classification and contribution degree of attribute set are defined respectively. Indiscernibility relation based on attribute contribution degree is presented. Analysis on the example shows that the indiscernibility relation is more agile and reasonable, and the relation in special conditions equals another indiscernibility relation.

Key words: incomplete information system, rough set, indiscernibility relation, tolerance relation, similarity relation

中图分类号: 

• TP391