Abstract
The characteristics of poor information in database and the requirement of poor information data mining are analyzed. Based on gray trend relational degree and general system theory, the model of gray trend relational system is investigated. As an application of this model, the gray trend clustering method is presented. Based on the scanty data of some examination papers in a teaching evaluation, all kinds of papers are clustered by gray trend clustering method, and the clustering result accords with fact. It shows that the gray trend clustering method is valid, convenient and practical. Gray trend relational clustering is one of gray relational analysis methods that included in the gray trend relational system. Using it to mine the poor information in the database will be an important development to the data mining method.
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