在经典粗糙集模型的基础上引入了参数β(0≤β【0.5),得到变精度粗糙集模型。讨论变精度粗糙集模型上、下近似算子的一些性质,即随着分类误差β的增大,X的正域与负域均扩大,边界缩小。同时通过经典的例子,说明变精度粗糙集模型相对于经典粗糙集模型其精确性提高了。
The parameterβ(0 ≤β< 0.5)is introduced based on the classical rough set model in this paper.obtaining the variable precision rough set model.And the paper discusses some properties of upper and lower approximation operators in variable precision rough set model.With the increase of classifica-tion error,positive field and negative field are expanded, but boundary shrinking. At the same time through a classic example,it illustrates the variable precision compared with the classical rough set model and it’s improved accuracy of rough set model.