关键词: 不完备信息系统, 双论域, 决策粗糙集, 双相对定量

Abstract: Rough set models on two universes are valuable generalizations of classical rough set model. In recent years, different kinds of rough set models on two universes have been established. In order to characterize relative quantitative information within incomplete information system, this paper establishes two kinds of double relative quantitative decision-theoretic rough sets on two universes based on rough set models on two universes, discusses the properties of the proposed models, and explores some interesting relations between above mentioned two models by adjusting different parameters. Finally, this paper uses a SARS dataset to illustrate the definition and relations of the proposed rough set models.

Key words: incomplete information system, two universes, decision-theoretic rough sets, double relative quantitative