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An evaluation of Bradfordizing effects

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Mayr, Philipp

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Abstract The purpose of this paper is to apply and evaluate the bibliometric method Bradfordizing for information retrieval (IR) experiments. Bradfordizing is used for generating core document sets for subject-specific questions and to reorder result sets from distributed searches. The method will be applied and tested in a controlled scenario of scientific literature databases from social and political sciences, economics, psychology and medical science (SOLIS, SoLit, USB Köln Opac, CSA Sociological Abstracts, World Affairs Online, Psyndex and Medline) and 164 standardized topics. An evaluation of the method and its effects is carried out in two laboratory-based information retrieval experiments (CLEF and KoMoHe) using a controlled document corpus and human relevance assessments. The results show that Bradfordizing is a very robust method for re-ranking the main document types (journal articles and monographs) in today’s digital libraries (DL). The IR tests show that relevance distributions after re-ranking improve at a significant level if articles in the core are compared with articles in the succeeding zones. The items in the core are significantly more often assessed as relevant, than items in zone 2 (z2) or zone 3 (z3). The improvements between the zones are statistically significant based on the Wilcoxon signed-rank test and the paired T-Test. (author's abstract)
Keywords technical literature; information system; ranking; data bank; data preparation; information science; information retrieval
Classification Scientometrics, Bibliometrics, Informetrics
Method applied research; empirical
Free Keywords Digitale Bibliothek; Digital Library; Bradfordizing
Collection Title Proceedings of WIS 2008
Editor Kretschmer, Hildrun; Havemann, Frank
Conference Fourth International Conference on Webometrics, Informetrics and Scientometrics & Ninth COLLNET Meeting. Berlin, 2008
Document language English
Publication Year 2009
Publisher Verl. d. Ges. für Wiss.-Forschung e.V.
City Berlin
Page/Pages p. 1-8
ISBN 978-3-934682-45-0
Status Published Version; reviewed
Licence Deposit Licence - No Redistribution, No Modifications