关键词: 变精度粗糙集, 程度粗糙集, 近似

Abstract: Rough set theory emerges as a powerful tool for dealing with the vagueness and uncertainty of facts，which has been widely applied in many fields such as artificial intelligence and data mining.In this paper，a degree-variable precision rough set model based on variable precision rough set and the degree of rough set is proposed by introducing a concept of error parameters．Some properties of the upper approximation and the lower approximation are generalized.Then an example is cited to demonstrate that the model is more feasible and effective than the previous ones in practice．

Key words: variable precision rough set, the degree of rough set, approximation