Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Effekten av avståndsoperatorer samt expansion med synonymer med avseende på återvinningseffektiviteten
University of Borås, Swedish School of Library and Information Science.
2006 (Swedish)Independent thesis Advanced level (degree of Master (One Year))Student thesisAlternative title
The effects of proximity operators and query expansion with synonyms on retrieval performance (English)
Abstract [en]

This thesis examines the effects of proximity operators and query expansion with synonyms on retrieval performance. The queries were expanded with synonyms and structured with proximity operators where the permitted distance between terms varied from 1 to 3. The expansion terms were selected from the online lexical reference system WordNet. Initial query terms were selected from 28 topics that contained compound words and were chosen on the basis of their expandibility. The English morphological analyser ENGTWOL was used for normalization of query terms. Queries were executed in the Interactive Query Performance Analyser, QPA, containing the InQuery system. The test collection used was TREC-UTA containing documents, topics and a set of relevant documents per given topic. The measures used in the study were average precision, precision at 10 retrieved documents and recall at 200 retrieved documents. The results of the study show that query expansion with synonyms did not improve retrieval performance and neither did query structuring with proximity operators. This result was in a way surprising since earlier studies have obtained improvements when queries were expanded and structured. Further investigation on phrases using proximity operators was also suggested.

Place, publisher, year, edition, pages
University College of Borås. Swedish School of Library and Information Science (SSLIS) , 2006.
Series
Magisteruppsats i biblioteks- och informationsvetenskap vid Bibliotekshögskolan/Biblioteks- och informationsvetenskap, ISSN 1404-0891 ; 2006:87
Keywords [en]
library and information science
Keywords [sv]
biblioteks- och informationsvetenskap
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:hb:diva-18283Local ID: 2320/1502OAI: oai:DiVA.org:hb-18283DiVA, id: diva2:1310199
Note
Uppsatsnivå: DAvailable from: 2019-04-30 Created: 2019-04-30

Open Access in DiVA

fulltext(176 kB)3 downloads
File information
File name FULLTEXT01.pdfFile size 176 kBChecksum SHA-512
9598e0ca31f93b83b7caac520904725a80ff4d6e41a028102a2e54ac7cc0b36c63a862eeced632a423d750ec1c493f6978d1e5c033220b7a34845f1a06c437f5
Type fulltextMimetype application/pdf

By organisation
Swedish School of Library and Information Science
Social Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 3 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 6 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf