Roll-Up and Drill-Down Building Algorithms of Layered Concept Lattice
ZHANG Jialu1, WU Xia1, ZHONG Jiaming2, LU Ruhua3
1.College of Mathematics and Finance, Xiangnan University, Chenzhou 423000 2.College of Economic and Management, Xiangnan University, Chenzhou 423000 3.College of Software and Communication Engineering, Xiangnan University, Chenzhou 423000
Abstract：A model of layered concept lattice is established, when the attributes of a formal context can be decomposed into some sub-attributes. The relationship between the original concept lattice and the layered concept lattice is discussed. Two algorithms are proposed: the roll-up algorithm and the drill-down algorithm. In the roll-up algorithm, the upper concept is constructed by the lower concept, and in the drill-down algorithm, the lower concept is constructed by the upper concept. Examples and numerical experiments show that the layered concept lattice model can be used to model complex attribute data. Furthermore, the roll-up algorithm and the drill-down algorithm improve the efficiency of building concept lattice.
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2018, Vol. 31 
