An evaluation of Bradfordizing effects

Mayr, Philipp An evaluation of Bradfordizing effects., 2008 . In Fourth International Conference on Webometrics, Informetrics and Scientometrics & Ninth COLLNET Meeting, Humboldt-Universität zu Berlin, Institute for Library and Information Science (IBI). [Conference paper]


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English 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.

Item type: Conference paper
Keywords: Informetrics, Information retrieval, evaluation, Bradfordizing
Subjects: H. Information sources, supports, channels. > HL. Databases and database Networking.
A. Theoretical and general aspects of libraries and information. > AC. Relationship of LIS with other fields .
B. Information use and sociology of information > BB. Bibliometric methods
H. Information sources, supports, channels. > HA. Periodicals, Newspapers.
L. Information technology and library technology > LZ. None of these, but in this section.
I. Information treatment for information services > II. Filtering.
Depositing user: Philipp Mayr
Date deposited: 09 Sep 2008
Last modified: 02 Oct 2014 12:12


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