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PrefixSpan: Mining Sequential Patterns by Prefix-Projected Pattern

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Author(s): Poonam Sharma | Gudla.Balakrishna

Journal: International Journal of Computer Science and Engineering Survey
ISSN 0976-3252

Volume: 2;
Issue: 4;
Start page: 111;
Date: 2011;
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Keywords: Sequential pattern | frequent pattern | candidate sequences | sequence database.

ABSTRACT
Sequential pattern mining discovers frequent subsequences as patterns in a sequence database. Most ofthe previously developed sequential pattern mining methods, such as GSP, explore a candidategeneration-and-test approach [1] to reduce the number of candidates to be examined. However, thisapproach may not be efficient in mining large sequence databases having numerous patterns and/or longpatterns. In this paper, we propose a projection-based, sequential pattern-growth approach for efficientmining of sequential patterns. In this approach, a sequence database is recursively projected into a set ofsmaller projected databases, and sequential patterns are grown in each projected database by exploringonly locally frequent fragments. Based on an initial study of the pattern growth-based sequential patternmining, FreeSpan, we propose a more efficient method, called PSP, which offers ordered growth andreduced projected databases technique is developed in PrefixSpan.

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Tangokurs Rapperswil-Jona

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