Results 191 to 200 of about 888 (226)

AN EXACT FORMULATION OF BRADFORD'S LAW

Journal of Documentation, 1980
An exact, discrete formulation of Bradford's law describing the distribution of articles in journals is derived by showing that Bradford's law is a special case of the Zipf‐Mandelbrot ‘rank frequency’ law. A relatively simple method is presented for fitting the model to empirical data and estimating the number of journals and articles in a subject ...
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A relationship between Lotka's Law, Bradford's Law, and Zipf's Law

Journal of the American Society for Information Science, 1986
A common functional relationship among Lotka's law, Bradford's law, and Zipf's law is derived. The proof takes explicit account of the sequences of observed values of the variables by means of an index. This approach results in a more realistic and precise formulation of each law. © 1986 John Wiley & Sons, Inc.
Ye-Sho Chen, Ferdinand F. Leimkuhler
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The yield formula and bradford's law

Journal of the American Society for Information Science, 1976
AbstractThe relation between a number of n top producing journals and their cumulative yield R(n)—articles, loans—is expressed by a yield graph (Figs. 1 and 3). Graphically, by linearization of the yield graph (Figs. 2 and 4), the following yield formula is deduced (Fig. 5): \documentclass{article}\pagestyle{empty}\begin{document}$ R\left(n \right) = h\
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Hierarchical distributions and Bradford's Law

Journal of the American Society for Information Science, 1992
A probabilistic model of random fragmentation of the unit line provides the formal underpinning for deriving a distribution of the articles published in any field, over journals ranked in decreasing order of productivity. No assumptions need to be made about the causal mechanism that brings about such a distribution.
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On the naranan interpretation of Bradford's law

Journal of the American Society for Information Science, 1976
AbstractThe Naranan interpretation of the original form of Bradford's Law does not follow from a stochastic argument based on his assumptions.
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Bradford's Law and the Bibliography of Science

Nature, 1969
The rationalization of scientific library systems might be greatly facilitated by the application of Bradford's law, formulated more than twenty years ago.
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THEORY OF THE BRADFORD LAW

Journal of Documentation, 1977
The Bradford law is explored theoretically by means of a very mixed Poisson model which, it is claimed, elucidates the uncertainties surrounding the law and its applications. It is argued that Bradford succeeded in formulating an empirical regularity which has pure and hybrid forms but that all the variants can be subsumed under a simple logarithmic ...
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THE AMBIGUITY OF BRADFORD'S LAW

Journal of Documentation, 1972
Recent discussion of Bradford's law of scatter has been founded on two formulations that are not mathematically equivalent. A method of comparing the two formulations against empirical data is developed, and the results using four sets of existing data are discussed. The results show that one particular formulation is more consistent with the practical
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BRADFORD'S LAW OF SCATTERING

Journal of Documentation, 1948
DURING the course of an analysis of some 1,600 periodical references, borrowed by the library of Butterwick Research Laboratories from outside libraries, the results of the analysis were compared with studies on the scatter of articles in periodicals carried out at the Science Library.
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The Haitun dichotomy and the relevance of Bradford's law

Journal of Information Science, 1984
In a critical review of all the empirical laws of bibliometrics and scientometrics, the Russian statistician S.D. Haitun has shown that the application of modern statistical theory to social science data is 'inadmissible', i.e. it 'does not work'. Haitun thus points to the need to develop a wholly new statistical theory for the social
K. Sparck Jones, B.C. Brookes
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