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A New Explanation of Some Leiden Ranking Graphs Using Exponential Functions
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 Title & Authors
A New Explanation of Some Leiden Ranking Graphs Using Exponential Functions
Egghe, Leo;
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 Abstract
A new explanation, using exponential functions, is given for the S-shaped functional relation between the mean citation score and the proportion of top 10% (and other percentages) publications for the 500 Leiden Ranking universities. With this new model we again obtain an explanation for the concave or convex relation between the proportion of top publications, for different fractions of .
 Keywords
Leiden ranking;exponential function;mean citation rate;S-shaped;
 Language
English
 Cited by
 References
1.
Egghe, L. (2013). Informetric explanation of some Leiden Ranking graphs. Journal of the American Society for Informetric Science and Technology, to appear.

2.
Egghe, L. & Rousseau, R. (2012). Theory and practise of the shifted Lotka function. Scientometrics, 91(1), 295-301. crossref(new window)

3.
Waltman, L., Calero-Medina, C., Kosten, J., Noyons, E. C.M., Tijssen, R. J.W., van Eck, N.J., van Leeuwen, T.N., van Raan, A. F.J., Visser, M.S., & Wouters, P. (2012). The Leiden Ranking 2011/2012: Data collection, indicators, and interpretation. Journal of the American Society for Information Science and Technology, 63(12), 2419-2432. crossref(new window)