THE DERIVATION AND APPLICATION OF THE BRADFORDZIPF DISTRIBUTION

THE DERIVATION AND APPLICATION OF THE BRADFORDZIPF DISTRIBUTION Any statistical regularities found in documentation should be fully exploited to produce estimates or predictions and to save documentalists work. But present formulations of the Bradford distribution demand penetrating search for peripheral papers and tedious computation in application. The present paper shows that the Bradford distribution is closely related to the Zipf distribution. It requires data on only the most productive journals, is mathematically simple and amenable to graphical methods if a proposed idea of the completeness of a search is accepted. For comparability of results, certain conditions, which include a specified minimum level of productivity of journals, need to be standardized. A standard form is suggested. It is found, however, that a modified form of the Bradford distribution is required when Bradfordtype collections of journals are merged into larger collections, when saturation of the most productive journals occurs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Documentation Emerald Publishing

THE DERIVATION AND APPLICATION OF THE BRADFORDZIPF DISTRIBUTION

Journal of Documentation, Volume 24 (4): 19 – Apr 1, 1968

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0022-0418
DOI
10.1108/eb026457
Publisher site
See Article on Publisher Site

Abstract

Any statistical regularities found in documentation should be fully exploited to produce estimates or predictions and to save documentalists work. But present formulations of the Bradford distribution demand penetrating search for peripheral papers and tedious computation in application. The present paper shows that the Bradford distribution is closely related to the Zipf distribution. It requires data on only the most productive journals, is mathematically simple and amenable to graphical methods if a proposed idea of the completeness of a search is accepted. For comparability of results, certain conditions, which include a specified minimum level of productivity of journals, need to be standardized. A standard form is suggested. It is found, however, that a modified form of the Bradford distribution is required when Bradfordtype collections of journals are merged into larger collections, when saturation of the most productive journals occurs.

Journal

Journal of DocumentationEmerald Publishing

Published: Apr 1, 1968

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