A New Extended Rough Set Model Based on the Dynamic Tolerance Relation and Improved Tolerance Degree Calculating Method

Authors:
Xia Ji;Longshu Li;Shengbing Chen;Yi Xu
Affiliations:
-;-;-;-
Venue:
APCIP '09 Proceedings of the 2009 Asia-Pacific Conference on Information Processing - Volume 01
Year:
2009

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Abstract

A dynamic tolerance relation of extended rough set model is presented on the basis of analyzing the existing models. Firstly, an improved method to calculate the tolerance degree of two objects more objective is given. On this basis, a dynamic tolerance degree parameter is selected in this paper. It can adjust the extended model from equivalence relation to tolerance relation, besides it can adjust its value dynamically according to the dynamic adjustment of data set, so it can enlarge the scale of data which can be disposed by this model and enhance the model’s disposal ability. The UCI database is selected to demonstrate the validity of this new extended model.