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  • × author_ss:"Egghe, L."
  1. Egghe, L.: Mathematical theories of citation (1998) 0.02 
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  2. Egghe, L.: Dynamic h-index : the Hirsch index in function of time (2007) 0.02 
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  3. Egghe, L.; Rousseau, R.: ¬An h-index weighted by citation impact (2008) 0.02 
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  4. Egghe, L.: On the relation between the association strength and other similarity measures (2010) 0.02 
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  5. Egghe, L.: Informetric explanation of some Leiden Ranking graphs (2014) 0.02 
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  6. Egghe, L.: Mathematical study of h-index sequences (2009) 0.01 
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    Abstract
    This paper studies mathematical properties of h-index sequences as developed by Liang [Liang, L. (2006). h-Index sequence and h-index matrix: Constructions and applications. Scientometrics, 69(1), 153-159]. For practical reasons, Liming studies such sequences where the time goes backwards while it is more logical to use the time going forward (real career periods). Both type of h-index sequences are studied here and their interrelations are revealed. We show cases where these sequences are convex, linear and concave. We also show that, when one of the sequences is convex then the other one is concave, showing that the reverse-time sequence, in general, cannot be used to derive similar properties of the (difficult to obtain) forward time sequence. We show that both sequences are the same if and only if the author produces the same number of papers per year. If the author produces an increasing number of papers per year, then Liang's h-sequences are above the "normal" ones. All these results are also valid for g- and R-sequences. The results are confirmed by the h-, g- and R-sequences (forward and reverse time) of the author.
  7. Egghe, L.; Rousseau, R.: Topological aspects of information retrieval (1998) 0.01 
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    Abstract
    Let (DS, DQ, sim) be a retrieval system consisting of a document space DS, a query space QS, and a function sim, expressing the similarity between a document and a query. Following D.M. Everett and S.C. Cater (1992), we introduce topologies on the document space. These topologies are generated by the similarity function sim and the query space QS. 3 topologies will be studied: the retrieval topology, the similarity topology and the (pseudo-)metric one. It is shown that the retrieval topology is the coarsest of the three, while the (pseudo-)metric is the strongest. These 3 topologies are generally different, reflecting distinct topological aspects of information retrieval. We present necessary and sufficient conditions for these topological aspects to be equal
  8. Egghe, L.: Sampling and concentration values of incomplete bibliographies (2002) 0.01 
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  9. Egghe, L.: Vector retrieval, fuzzy retrieval and the universal fuzzy IR surface for IR evaluation (2004) 0.01 
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  10. Egghe, L.; Rousseau, R.; Rousseau, S.: TOP-curves (2007) 0.01 
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  11. Egghe, L.; Rousseau, R.: Introduction to informetrics : quantitative methods in library, documentation and information science (1990) 0.01 
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  12. Egghe, L.: ¬The influence of transformations on the h-index and the g-index (2008) 0.01 
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  13. Egghe, L.: ¬A rationale for the Hirsch-index rank-order distribution and a comparison with the impact factor rank-order distribution (2009) 0.01 
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  14. Egghe, L.: ¬A new short proof of Naranan's theorem, explaining Lotka's law and Zipf's law (2010) 0.01 
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  15. Egghe, L.; Rousseau, R.: ¬The Hirsch index of a shifted Lotka function and its relation with the impact factor (2012) 0.01 
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  16. Egghe, L.: Remarks on the paper by A. De Visscher, "what does the g-index really measure?" (2012) 0.01 
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  17. Egghe, L.: Theory of the topical coverage of multiple databases (2013) 0.01 
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  18. Egghe, L.; Rousseau, R.; Hooydonk, G. van: Methods for accrediting publications to authors or countries : consequences for evaluation studies (2000) 0.01 
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  19. Egghe, L.; Rousseau, R.: Aging, obsolescence, impact, growth, and utilization : definitions and relations (2000) 0.01 
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  20. Egghe, L.: ¬A noninformetric analysis of the relationship between citation age and journal productivity (2001) 0.01 
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