Abstract
In a recent paper Egghe & Rousseau (2002) have readdressed the problem of defining the “core” of a subject's literature by focussing on the productivity of the contributing sources as measured by their influence on an overall concentration value. Here we generalise Egghe & Rousseau's empirical approach, based upon the Gini index, to a more theoretical setting. This allows a simple visualisation of the geometry of the procedure and a complete analysis in certain classic cases. We conclude that, without additional empirical support, the approach does not appear to offer real improvement on more established and intuitively appealing schemes.
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References
BRADFORD, S. C. (1934), Sources of information on specific subjects. Engineering, 137: 85–86.
BROWNSEY, K. W. R., BURRELL, Q. L. (1986), Library circulation distributions: some observations on the PLR sample. Journal of Documentation, 42: 22–45.
BURRELL, Q. L. (1980), A simple stochastic model for library loans. Journal of Documentation, 36: 115–132.
BURRELL, Q. L. (1985), The 80/20 rule: library lore or statistical law? Journal of Documentation, 41: 24–39.
BURRELL, Q. L. (1991), The Bradford distribution and the Gini index. Scientometrics, 21: 181–194.
BURRELL, Q. L. (1992a), The Gini index and the Leimkuhler curve for bibliometric processes. Information Processing and Management, 28: 19–33.
BURRELL, Q. L. (1992b), A note on a result of Rousseau for concentration measures. Journal of the American Society for Information Science, 43: 452–454.
BURRELL, Q. L. (1992). The dynamic nature of bibliometric processes: a case study. In: I. K. RAVICHANDRA RAO (Ed.), Informetrics 91: Selected Papers from the Third International Conference on Informetrics Bangalore, Ranganathan Endowment, pp. 97–129.
BURRELL, Q. L., CANE, V. R. (1982), The analysis of library data. (With discussion.) Journal of the Royal Statistical Society, Series A, 154: 439–471.
EGGHE, L., ROUSSEAU, R. (2001), The core of a scientific subject: an exact definition using concentration and fuzzy sets. In: M. DAVIS, C. S. WILSON (Eds), 8th International Conference on Scientometrics and Informetrics-Volume 1, Sydney, University of New South Wales, pp.147–156).
EGGHE, L., ROUSSEAU, R. (2002), A proposal to define a core of a scientific subject: a definition using concentration and fuzzy sets. Scientometrics, 54: 51–62.
LEIMKUHLER, F. F. (1967), The Bradford distribution. Journal of Documentation, 23: 197–207.
PRATT, A. D. (1979), A measure of class concentration in bibliometrics. Journal of the American Society for Information Science, 28: 285–292.
STIRZAKER, D. (1994), Elementary Probability. Cambridge, Cambridge University Press.
STUART, A., ORD, J. K. (1987), Kendall's Advanced Theory of Statistics. London, Griffin.
TRUESWELL, R. W. (1966), Determining the optimal number of volumes for a library's core collection. Libri, 16: 49–60.
TRUESWELL, R. W. (1969), Some behavioural patterns of library users: the 80/20 rule. Wilson Library Bulletin, 43: 458–461.
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Burrell, Q.L. Defining a core: Theoretical observations on the Egghe-Rousseau proposal. Scientometrics 57, 75–92 (2003). https://doi.org/10.1023/A:1023623603913
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DOI: https://doi.org/10.1023/A:1023623603913