【摘要】 提出了一种基于相似度的变精度粗糙集模型,该模型是变精度粗糙集模型在不完备信息系统中的拓展.定义了这种模型上的知识约简,并给出了求约简的两种一般算法.最后通过实例分析说明了算法的有效性.更多还原

【Abstract】 Knowledge reduction is one of the most important tasks in rough set theory,and most types of reductions in this area are based on complete information systems. However,many information systems are incomplete and some data are inaccurate in real world.In this paper,a new rough set model based on similarity degree is presented in incomplete information systems.This model extends the classical rough set model in complete information systems.Two heuristic algorithms based on the number of missing values and significance of attributes are proposed.Finally,an example is given to illustrate the validity of the presented algorithms.更多还原