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Incrementally updating approximations in rough set theory may contribute to enhancement of the efficiency of knowledge discovery. This paper firstly introduces the definitions of attribute values' coarsening and refining in set-valued information systems. Then the approach for incrementally updating approximations of a concept is presented while attribute values coarsening and refining. Finally, an...
In rough set theory (RST), upper and lower approximations of a concept will change dynamically while the information system varies over time. How to update approximations based on the original approximations' information is an important problem since it may improve the efficiency of knowledge discovery. This paper focuses on the approach for dynamically updating approximations when attribute values...
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