Attribute conjunction characteristics and recognition of loss-redundancy data

This paper uses P-sets to give the study of abnormal data in information system. P-sets has dynamic characteristics. The paper adds its attribute conjunction characteristics, namely the spread characteristics of the attribute conjunction and the shrinkage characteristics of the attribute conjunction. And the paper proposes F̅-lost data and F-redundancy data as well as F̅-lost cognizable degree and F - redundancy cognizable degree. Through using F̅-lost cognizable degree and F -redundancy cognizable degree, the paper gets recognition methods about F̅-lost data and F - redundancy data. Finally, the paper provides the application of recognition of loss and redundancy data. The research shows that F̅-lost data has the spread characteristics of the attribute conjunction and F-redundancy data has the shrinkage characteristics of the attribute conjunction. And P-sets is a new mathematical tool to study the dynamic information system.