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The Research of Data Mining Method Based on Interval Grey Set

Author: WeiLiFei
Tutor: WuShunXiang
School: Xiamen University
Course: Systems Engineering
Keywords: Rough Set Data Mining Data Preprocessing Grey System Interval grey set
CLC: TP311.13
Type: Master's thesis
Year: 2008
Downloads: 72
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Abstract


The Rough Set Theory and the Grey System Theory are both the effective tools of dealing with the uncertainty problems. Rough Set Theory targets at the limited capacity of distinguishing because of rough knowledge granularity or the unascertained uncertainty because of imprecise description of the data. The subjective unclear understanding and objective conditions or limitations cause these type of inaccuracy. Under the precondition of maintaining the ability of classification,Rough Set deals with the classification of the incomplete information and knowledge by means of knowledge reduction,then derive the decision-making or classification rules. The Grey system theory mainly by means of data generating to deal with the uncertainty of knowledge for data processing and information processing,focusing on "clear extension, unclear meaning",solving the "Small sample, poor information uncertainty" problems that can’t be settled by the Probability and Statistics and the Fuzzy Set,excavating the valuable knowledge and laws from the data.For huge databases such as marketing databanks,mining rules and acquiring knowledge are not easy. A new method was presented in this paper. This approach utilizes the attribute-oriented induction and attribute relevance analysis to generalize clients attributes and eliminate the redundant attributes to constitute a contracted decision-making information system based on data preprocessing. And then we use the reduction method of decision rule in rough set theory to extract valuable decision-making rules. A following example using the approach demonstrate it improves the efficiency of rule extraction to a certain extent, having great practical significance. In addition,for information deficiency and atttributes uncertainty problems, this paper studys the Rough Set extent model,and effectively integrate the Gray System Theory and Rough Set Theory,then put forward the gray tolerance relations based on interval grey set that concept introduced later in this paper. This paper combining the Grey System Theory and the Rough Set Theory to advance the improved method about interval grey set, and then present minimal consistent class based on the interval grey set .What is more ,It have a deep rearch on its properties and relations. It is a effective extention of classic Rough Set defined on the Grey Set.

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