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
Query Expansion: en jämförande studie av Automatisk Query Expansion med och utan relevans-feedback
University of Borås, Swedish School of Library and Information Science.
University of Borås, Swedish School of Library and Information Science.
2007 (Swedish)Independent thesis Advanced level (degree of Master (One Year))Student thesisAlternative title
Query Expansion : a comparative study of Automatic Query Expansion with and without relevance feedback (English)
Abstract [en]

In query expansion (QE) terms are added to an initial query in order to improve retrieval effectiveness. In this thesis we use QE in the sense that a reformulation of the query is done by deleting the terms in the initial query and instead replacing them with terms from the documents retrieved in the initial run. The aim of this thesis is to, in a experimental full text invironment, study and compare the retrieval result of two different query expansion strategies in relation to each other. The following questions are addressed by the study: How do the two strategies perform in relation to each other regarding recall? What may be causing the result? Are the two strategies retrieving the same relevant documents? Two strategies are designed to simulate a searcher using automatic query expansion (AQE) either with or without relevance feedback. Strategy I is simulating AQE without relevance feedback by taking the top five documents that are retrieved in the initial run and then extracting the top ten most frequently occurring terms in these to create a new query. Correspondingly the Strategy II, is simulating AQE with relevance feedback by taking the top five relevant documents and extracting the top ten terms in these to create a new query. It is concluded that both of the strategies’ retrieval performance was improved for most of the topics. In average Strategy II did achieve 54.63 percent recall compared to Strategy I which did achieve 45.59 percent recall. The two strategies did retrieve different relevant documents for majority of the topics. Hence, it would be reasonable to base a system on both of them.

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 ; 2007:4
Keywords [en]
query expansion, query reformulation, relevance feedback, inquery, återvinningseffektivitet, information retrieval
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:hb:diva-18416Local ID: 2320/1803OAI: oai:DiVA.org:hb-18416DiVA, id: diva2:1310332
Note
Uppsatsnivå: DAvailable from: 2019-04-30 Created: 2019-04-30

Open Access in DiVA

fulltext(184 kB)5 downloads
File information
File name FULLTEXT01.pdfFile size 184 kBChecksum SHA-512
3f21c687382dd550282fa843f5a32abad60a5114252c7e88d5b358275757266fbb6012b2f325d8c08176f688510975da384b0c287c3dd37b79ad82b2a1c2957a
Type fulltextMimetype application/pdf

By organisation
Swedish School of Library and Information Science
Social Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 5 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: 2 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
http://hb.diva-portal.org/smash/record.jsf?pid=diva2:1310332
hb.diva-portal.org
crawl=CC-MAIN-2019-39
77986
application/http; msgtype=response
sha1:7JBLMOMAHM7QQSAK7XIV5TXWFVY4ANGT
<urn:uuid:6b6784fc-54f9-4b85-8526-6ca0de56fc1d>
2019-09-15T05:53:15Z
130.238.7.114
application/xhtml+xml
sha1:44744PLBHBNNUW3MCVKGGHI3LQ6VRBL7
<urn:uuid:65d5c124-0e43-49c9-9cb6-d78bc7e4c963>
http://hb.diva-portal.org/smash/record.jsf?pid=diva2:1310332
response
<urn:uuid:a0e9a854-5e6b-4b38-8326-6bb58c8ae0d9>
isPartOf: CC-MAIN-2019-39
publisher: Common Crawl
description: Wide crawl of the web for September 2019
operator: Common Crawl Admin (info@commoncrawl.org)
hostname: ip-10-67-67-127.ec2.internal
software: Apache Nutch 1.15 (modified, https://github.com/commoncrawl/nutch/)
robots: checked via crawler-commons 1.1-SNAPSHOT (https://github.com/crawler-commons/crawler-commons)
format: WARC File Format 1.1
conformsTo: http://iipc.github.io/warc-specifications/specifications/warc-format/warc-1.1/