June 2011
Beginner to intermediate
744 pages
25h 11m
English
Content preview from Data Mining: Concepts and Techniques, 3rd Edition
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5.5 Summary
■ Data cube computation and exploration play an essential role in data warehousing and are important for flexible data mining in multidimensional space.
■ A data cube consists of a lattice of cuboids. Each cuboid corresponds to a different degree of summarization of the given multidimensional data. Full materialization refers to the computation of all the cuboids in a data cube lattice. Partial materialization refers to the selective computation of a subset of the cuboid cells in the lattice. Iceberg cubes and shell fragments are examples of partial materialization. An iceberg cube is a data cube that stores only those cube cells that have an aggregate value (e.g., count) above some minimum support threshold. For shell fragments ...
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