Search (34 results, page 1 of 2)

  • × author_ss:"Egghe, L."
  • × year_i:[2000 TO 2010}
  1. Egghe, L.: ¬A universal method of information retrieval evaluation : the "missing" link M and the universal IR surface (2004) 0.02 
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    Date
    14. 8.2004 19:17:22
    Language
    e
  2. Egghe, L.: Expansion of the field of informetrics : the second special issue (2006) 0.00 
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  3. Egghe, L.: Expansion of the field of informetrics : origins and consequences (2005) 0.00 
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  4. Egghe, L.: ¬A noninformetric analysis of the relationship between citation age and journal productivity (2001) 0.00 
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    Abstract
    A problem, raised by Wallace (JASIS, 37,136-145,1986), on the relation between the journal's median citation age and its number of articles is studied. Leaving open the problem as such, we give a statistical explanation of this relationship, when replacing "median" by "mean" in Wallace's problem. The cloud of points, found by Wallace, is explained in this sense that the points are scattered over the area in first quadrant, limited by a curve of the form y=1 + E/x**2 where E is a constant. This curve is obtained by using the Central Limit Theorem in statistics and, hence, has no intrinsic informetric foundation. The article closes with some reflections on explanations of regularities in informetrics, based on statistical, probabilistic or informetric results, or on a combination thereof
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  5. Egghe, L.; Ravichandra Rao, I.K.: Duality revisited : construction of fractional frequency distributions based on two dual Lotka laws (2002) 0.00 
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    Abstract
    Fractional frequency distributions of, for example, authors with a certain (fractional) number of papers are very irregular and, therefore, not easy to model or to explain. This article gives a first attempt to this by assuming two simple Lotka laws (with exponent 2): one for the number of authors with n papers (total count here) and one for the number of papers with n authors, n E N. Based an an earlier made convolution model of Egghe, interpreted and reworked now for discrete scores, we are able to produce theoretical fractional frequency distributions with only one parameter, which are in very close agreement with the practical ones as found in a large dataset produced earlier by Rao. The article also shows that (irregular) fractional frequency distributions are a consequence of Lotka's law, and are not examples of breakdowns of this famous historical law.
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  6. Egghe, L.; Rousseau, R.: ¬The influence of publication delays on the observed aging distribution of scientific literature (2000) 0.00 
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  7. Egghe, L.; Liang, L.; Rousseau, R.: ¬A relation between h-index and impact factor in the power-law model (2009) 0.00 
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  8. Egghe, L.: Dynamic h-index : the Hirsch index in function of time (2007) 0.00 
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  9. Egghe, L.; Rousseau, R.: ¬An h-index weighted by citation impact (2008) 0.00 
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  10. Egghe, L.: Sampling and concentration values of incomplete bibliographies (2002) 0.00 
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  11. Egghe, L.: Vector retrieval, fuzzy retrieval and the universal fuzzy IR surface for IR evaluation (2004) 0.00 
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  12. Egghe, L.; Rousseau, R.; Rousseau, S.: TOP-curves (2007) 0.00 
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  13. Egghe, L.: ¬The influence of transformations on the h-index and the g-index (2008) 0.00 
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  14. Egghe, L.; Liang, L.; Rousseau, R.: Fundamental properties of rhythm sequences (2008) 0.00 
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  15. Egghe, L.: ¬A rationale for the Hirsch-index rank-order distribution and a comparison with the impact factor rank-order distribution (2009) 0.00 
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  16. Egghe, L.; Rousseau, R.; Hooydonk, G. van: Methods for accrediting publications to authors or countries : consequences for evaluation studies (2000) 0.00 
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  17. Egghe, L.; Rousseau, R.: Aging, obsolescence, impact, growth, and utilization : definitions and relations (2000) 0.00 
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  18. Egghe, L.: Relations between the continuous and the discrete Lotka power function (2005) 0.00 
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  19. Egghe, L.: Zipfian and Lotkaian continuous concentration theory (2005) 0.00 
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  20. Egghe, L.; Ravichandra Rao, I.K.: Study of different h-indices for groups of authors (2008) 0.00 
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