Results 231 to 240 of about 1,039 (265)

ON THE UNITY OF BRADFORD'S LAW

Journal of Documentation, 1984
It is shown that there is no ambiguity in Bradford's theory of distribution. Starting with the two basic postulates laid down by Bradford, a mathematical expression is derived such that its curve agrees with the experimentally plotted data.
M. J. F. Maia, M. D. Maia
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Dynamic behavior of Bradford's law

Journal of the American Society for Information Science, 1995
This paper examines two problems associated with Bradford's law: (1) Since empirical data deviate from the law in many applications, what are the significant factors influencing the Bradford graphs? (2) What will be the evolution over time of the Bradford graphs?
Ye-Sho Chen, P. Pete Chong, Morgan Y. Tong   +2 more
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CONSEQUENCES OF LOTKA'S LAW FOR THE LAW OF BRADFORD

Journal of Documentation, 1985
In this paper we start from the well‐known fact that from the law of ...
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Bradford's Law and its relevance to researchers

Education for Information, 2011
Bradford's Law has been the subject of much discussion and analysis in library and information science since its formulation in the 1930s and remains frequently debated to this day. It has been applied to various practices within the discipline, especially with regard to collection development, but its relevance to researchers and the potential it ...
Andrew K. Shenton, Naomi V. Hay-Gibson
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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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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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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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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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