Literatur zur Informationserschließung

Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.

© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 04. Juni 2021)

Suchergebnisse

• 1
  Rousseau, R.: Egghe's g-index is not a proper concentration measure.
  In: Journal of the Association for Information Science and Technology. 66(2015) no.7, S.1518-1519.
  (Letter to the editor)
  
  Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23276/abstract.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 2
  Bartolucci, F.: ¬A comparison between the g-index and the h-index based on concentration.
  In: Journal of the Association for Information Science and Technology. 66(2015) no.12, S.2708-2710.
  (Brief communications)
  
  Abstract: I discuss how, given a certain number of articles and citations of these articles, the h-index and the g-index are affected by the level of concentration of the citations. This offers the opportunity for a comparison between these 2 indices from a new perspective.
  
  Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23440/abstract.
  
  Themenfeld: Informetrie
  Objekt: g-index ; h-index
  
  
• 3
  Prathap, G.: Measures for impact, consistency, and the h- and g-indices.
  In: Journal of the Association for Information Science and Technology. 65(2014) no.5, S.1076-1078.
  (Brief communication)
  
  Abstract: An altogether different view on the properties of a good performance measure than that given in Egghe (2012) is offered. Egghe argued that a good impact measure should reward nonconsistency; that is, the more citations over papers are unequally distributed, the higher the impact should be. Here, a quantitative proxy for consistency is offered, and it is shown that as consistency increases, the ideal performance measure, which is sensitive to changes in consistency, should increase, reflecting this virtue.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index
  
  
• 4
  Egghe, L.: ¬A good normalized impact and concentration measure.
  In: Journal of the Association for Information Science and Technology. 65(2014) no.10, S.2052-2054.
  (Brief communication)
  
  Abstract: It is shown that a normalized version of the g-index is a good normalized impact and concentration measure. A proposal for such a measure by Bartolucci is improved.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 5
  Abramo, G. ; D'Angelo, C.A. ; Viel, F.: Assessing the accuracy of the h- and g-indexes for measuring researchers' productivity.
  In: Journal of the American Society for Information Science and Technology. 64(2013) no.6, S.1224-1234.
  
  Abstract: Bibliometric indicators are increasingly used in support of decisions about recruitment, career advancement, rewards, and selective funding for scientists. Given the importance of the applications, bibliometricians are obligated to carry out empirical testing of the robustness of the indicators, in simulations of real contexts. In this work, we compare the results of national-scale research assessments at the individual level, based on the following three different indexes: the h-index, the g-index, and "fractional scientific strength" (FSS), an indicator previously proposed by the authors. For each index, we construct and compare rankings lists of all Italian academic researchers working in the hard sciences during the period 2001-2005. The analysis quantifies the shifts in ranks that occur when researchers' productivity rankings by simple indicators such as the h- or g-indexes are compared with those by more accurate FSS.
  
  Themenfeld: Informetrie
  Objekt: g-index ; h-index ; FSS
  
  
• 6
  Visscher, A. De: Response to "remarks on the paper by a. De Visscher, 'what does the g-index really measure?' ".
  In: Journal of the American Society for Information Science and Technology. 62(2013) no.9, S.1960-1962.
  (Brief communications)
  
  Anmerkung: Vgl.: Visscher, A. De: What does the g-index really measure?. In: Journal of the American Society for Information Science and Technology. 62(2011) no.11, S.2290-2293.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 7
  Hovden, R.: Bibliometrics for Internet media : applying the h-index to YouTube.
  In: Journal of the American Society for Information Science and Technology. 64(2013) no.11, S.2326-2331.
  
  Abstract: The h-index can be a useful metric for evaluating a person's output of Internet media. Here I advocate and demonstrate adaption of the h-index and the g-index to the top video content creators on YouTube. The h-index for Internet video media is based on videos and their view counts. The h-index is defined as the number of videos with >=h × 10**5 views. The g-index is defined as the number of videos with >=g × 10**5 views on average. When compared with a video creator's total view count, the h-index and g-index better capture both productivity and impact in a single metric.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index ; YouTube
  
  
• 8
  Schreiber, M.: Do we need the g-index?.
  In: Journal of the American Society for Information Science and Technology. 64(2013) no.11, S.2396-2399.
  (Brief communication)
  
  Abstract: Using a very small sample of 8 data sets it was recently shown by De Visscher (2011) that the g-index is very close to the square root of the total number of citations. It was argued that there is no bibliometrically meaningful difference. Using another somewhat larger empirical sample of 26 data sets I show that the difference may be larger and I argue in favor of the g-index.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 9
  Egghe, L.: Remarks on the paper by A. De Visscher, "what does the g-index really measure?".
  In: Journal of the American Society for Information Science and Technology. 63(2012) no.10, S.2118-2121.
  (Brief communication)
  
  Abstract: The author presents a different view on properties of impact measures than given in the paper of De Visscher (2011). He argues that a good impact measure works better when citations are concentrated rather than spread out over articles. The author also presents theoretical evidence that the g-index and the R-index can be close to the square root of the total number of citations, whereas this is not the case for the A-index. Here the author confirms an assertion of De Visscher.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 10
  Visscher, A. De: What does the g-index really measure?.
  In: Journal of the American Society for Information Science and Technology. 62(2011) no.11, S.2290-2293.
  (Brief communications)
  
  Abstract: It was argued recently that the g-index is a measure of a researcher's specific impact (i.e., impact per paper) as much as it is a measure of overall impact. While this is true for the productive "core" of publications, it can be argued that the g-index does not differ from the square root of the total number of citations in a bibliometrically meaningful way when the entire publication list is considered. The R-index also has a tendency to follow total impact, leaving only the A-index as a true measure of specific impact. The main difference between the g-index and the h-index is that the former penalizes consistency of impact whereas the latter rewards such consistency. It is concluded that the h-index is a better bibliometric tool than is the g-index, and that the square root of the total number of citations is a convenient measure of a researcher's overall impact.
  
  Anmerkung: Vgl.: Visscher, A. De: Response to "remarks on the paper by a. De Visscher, 'what does the g-index really measure?' ". In: Journal of the American Society for Information Science and Technology. 62(2013) no.9, S.1960-1962.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 11
  Zhang, C.-T.: Relationship of the h-index, g-index, and e-index.
  In: Journal of the American Society for Information Science and Technology. 61(2010) no.3, S.625-628.
  (Brief communications)
  
  Abstract: Of h-type indices available now, the g-index is an important one in that it not only keeps some advantages of the h-index but also counts citations from highly cited articles. However, the g-index has a drawback that one has to add fictitious articles with zero citation to calculate this index in some important cases. Based on an alternative definition without introducing fictitious articles, an analytical method has been proposed to calculate the g-index based approximately on the h-index and the e-index. If citations for a scientist are ranked by a power law, it is shown that the g-index can be calculated accurately by the h-index, the e-index, and the power parameter. The relationship of the h-, g-, and e-indices presented here shows that the g-index contains the citation information from the h-index, the e-index, and some papers beyond the h-core.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index ; e-index
  
  
• 12
  Abramo, G. ; D'Angelo, C.A. ; Viel, F.: ¬A robust benchmark for the h- and g-indexes.
  In: Journal of the American Society for Information Science and Technology. 61(2010) no.6, S.1275-1280.
  
  Abstract: The use of Hirsch's h-index as a joint proxy of the impact and productivity of a scientist's research work continues to gain ground, accompanied by the efforts of bibliometrists to resolve some of its critical issues through the application of a number of more or less sophisticated variants. However, the literature does not reveal any appreciable attempt to overcome the objective problems of measuring h-indexes on a large scale for purposes of comparative evaluation. Scientists may succeed in calculating their own h-indexes but, being unable to compare them to those of their peers, they are unable to obtain truly useful indications of their individual research performance. This study proposes to overcome this gap, measuring the h- and Egghe's g-indexes of all Italian university researchers in the hard sciences over a 5-year window. Descriptive statistics are provided concerning all of the 165 subject fields examined, offering robust benchmarks for those who wish to compare their individual performance to those of their colleagues in the same subject field.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index
  
  
• 13
  Woeginger, G.J.: Generalizations of Egghe's g-index.
  In: Journal of the American Society for Information Science and Technology. 60(2009) no.6, S.1267-1273.
  
  Abstract: This paper introduces the generalized Egghe-indices as a new family of scientific impact measures for ranking the output of scientific researchers. The definition of this family is strongly inspired by Egghe's well-known g-index. The main contribution of the paper is a family of axiomatic characterizations that characterize every generalized Egghe-index in terms of four axioms.
  
  Themenfeld: Informetrie
  Objekt: g-Index
  
  
• 14
  Schreiber, M.: Fractionalized counting of publications for the g-Index.
  In: Journal of the American Society for Information Science and Technology. 60(2009) no.10, S.2145-2150.
  
  Abstract: L. Egghe ([2008]) studied the h-index (Hirsch index) and the g-index, counting the authorship of cited articles in a fractional way. But his definition of the gF-index for the case that the article count is fractionalized yielded values that were close to or even larger than the original g-index. Here I propose an alternative definition by which the g-index is modified in such a way that the resulting gm-index is always smaller than the original g-index. Based on the interpretation of the g-index as the highest number of articles of a scientist that received on average g or more citations, in the specification of the new gm-index the articles are counted fractionally not only for the rank but also for the average.
  
  Themenfeld: Informetrie
  Objekt: g-index
  
  
• 15
  Schreiber, M.: Revisiting the g-index : the average number of citations in the g-core.
  In: Journal of the American Society for Information Science and Technology. 61(2010) no.1, S.169-174.
  
  Abstract: The g-index is discussed in terms of the average number of citations of the publications in the g-core, showing that it combines features of the h-index and the A-index in one number. For a visualization, data of 8 famous physicists are presented and analyzed. In comparison with the h-index, the g-index increases between 67% and 144%, on average by a factor of 2.
  
  Themenfeld: Informetrie
  Objekt: g-index ; h-index
  
  
• 16
  Egghe, L.: ¬The influence of transformations on the h-index and the g-index.
  In: Journal of the American Society for Information Science and Technology. 59(2008) no.8, S.1304-1312.
  
  Abstract: In a previous article, we introduced a general transformation on sources and one on items in an arbitrary information production process (IPP). In this article, we investigate the influence of these transformations on the h-index and on the g-index. General formulae that describe this influence are presented. These are applied to the case that the size-frequency function is Lotkaian (i.e., is a decreasing power function). We further show that the h-index of the transformed IPP belongs to the interval bounded by the two transformations of the h-index of the original IPP, and we also show that this property is not true for the g-index.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index
  
  
• 17
  Egghe, L.: Mathematical theory of the h- and g-index in case of fractional counting of authorship.
  In: Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.1608-1616.
  
  Abstract: This article studies the h-index (Hirsch index) and the g-index of authors, in case one counts authorship of the cited articles in a fractional way. There are two ways to do this: One counts the citations to these papers in a fractional way or one counts the ranks of the papers in a fractional way as credit for an author. In both cases, we define the fractional h- and g-indexes, and we present inequalities (both upper and lower bounds) between these fractional h- and g-indexes and their corresponding unweighted values (also involving, of course, the coauthorship distribution). Wherever applicable, examples and counterexamples are provided. In a concrete example (the publication citation list of the present author), we make explicit calculations of these fractional h- and g-indexes and show that they are not very different from the unweighted ones.
  
  Themenfeld: Informetrie
  Objekt: h-index ; g-index