Data has the characteristics of incompletion and dynamic state.In order to solve the prob-lem of low time efficiency of updating approximate sets by static algorithm in incomplete informa-tion systems,first,the definition of local rough sets model in incomplete information system is intro-duced.Then,according to the change of inclusion degree of objects,the relevant theorems of dynam-ic updating of local tolerance rough sets are given,and a dynamic updating algorithm of local rough sets is designed.Finally,the effectiveness and stability of the proposed dynamic updating algorithm are verified by simulation experiments with six datasets in UCI database.
incomplete information systemlocal rough setsinclusion degreedynamic updating
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