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Nominalfrasers inverkan på återvinningseffektiviteten i ett probabilistiskt IR-system
University of Borås, Swedish School of Library and Information Science.
2007 (Swedish)Independent thesis Advanced level (degree of Master (One Year))Student thesisAlternative title
The effects of noun phrases on the retrieval performance in a probabilistic IR system (English)
Abstract [en]

The purpose of this study is to examine the difference between three query strategies with respect to retrieval effectiveness. The thesis aims at examining how two types of noun phrases containing a modifier to the head word, which is a noun affect the retrieval performance with regard to recall and precision. The noun phrases in the thesis are of two types: 1) noun phrases containing a modifier to the head word (which is a noun) and which are not dictionary phrases (NF) and 2) dictionary phrases. Both types of noun phrases in this thesis contain at least two words. The queries were executed in Query Performance Analyser, QPA, containing the InQuery system and a sub collection of TREC-Uta documents with its topics. The measures used were R@200 and precision at 13 document cut-off values. In total, 20 topics were examined. All the documents and the queries were in English. The result of this study indicates that NFs have a negative effect on the retrieval performance and that dictionary phrases have a rather neutral effect on the retrieval performance.

Place, publisher, year, edition, pages
University of Borås/Swedish School of Library and Information Science (SSLIS) , 2007.
Series
Magisteruppsats i biblioteks- och informationsvetenskap vid institutionen Biblioteks- och informationsvetenskap, ISSN 1654-0247 ; 2007:46
Keywords [en]
nominalfraser, ordboksfraser, återvinningseffektivitet, information retrieval, QPA
Keywords [sv]
frasoperatorer, sökfrågor
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:hb:diva-18456Local ID: 2320/2154OAI: oai:DiVA.org:hb-18456DiVA, id: diva2:1310373
Note
Uppsatsnivå: DAvailable from: 2019-04-30 Created: 2019-04-30

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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Language
  • de-DE
  • en-GB
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  • nn-NO
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  • Other locale
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Output format
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