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Consider the problem of finding large itemsets. a. Describe how to find the support for a given collection of itemsets

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Consider the problem of finding large itemsets.

a. Describe how to find the support for a given collection of itemsets by using a single scan of the data. Assume that the itemsets and associated information, such as counts, will fit in memory.

b. Suppose an itemset has support less than j. Show that no superset of this itemset can have support greater than or equal to j.

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a Let S1 S2 Sn be the collection of item sets forwhich we want to find the support Associate a count…View the full answer


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Database System Concepts

Database System Concepts

ISBN: 978-0072554816

4th Edition

Authors: Henry F. Korth, S. Sudarshan

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Question Posted: January 29, 2011 01:42:28
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