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Absolute bounds on set intersection and union sizes from distribution information

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Author
Rowe, Neil C.
Date
1988-07
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Abstract
Estimation of set intersection and union sizes is important for access method selection for a database and other data retrieval problems. Absolute bounds on sizes are often easier to compute than estimates, requiring no distributional or independence assumptions, and can answer many of the same needs. We present a catalog of quick closed-form bounds on set intersection and union sizes; they can be expressed as rules, and managed by a rule-based system architecture. These methods use a variety of statistics precomputed on the data, and exploit homomorphisms (onto mappings) of the data items onto distributions that can be more easily analyzed. The methods can be used anytime, but tend to work best when there are strong or complex correlations in the data. This circumstance is poorly handled by the standard independence-assumption and distributional-assumption estimates, and hence our methods fill a need.
Description
The equations were redrawn in 2008.
 
 
IEEE Transactions on Software Engineering, SE-14, no. 7 (July 1988), 1033-1048. The equations were redrawn in 2008.
 
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/35977
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