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
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1Rousseau, R.: Egghe's gindex is not a proper concentration measure.
In: Journal of the Association for Information Science and Technology. 66(2015) no.7, S.15181519.
(Letter to the editor)
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23276/abstract.
Themenfeld: Informetrie
Objekt: gindex

2Bartolucci, F.: ¬A comparison between the gindex and the hindex based on concentration.
In: Journal of the Association for Information Science and Technology. 66(2015) no.12, S.27082710.
(Brief communications)
Abstract: I discuss how, given a certain number of articles and citations of these articles, the hindex and the gindex 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: gindex ; hindex

3Prathap, G.: Measures for impact, consistency, and the h and gindices.
In: Journal of the Association for Information Science and Technology. 65(2014) no.5, S.10761078.
(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: hindex ; gindex

4Egghe, L.: ¬A good normalized impact and concentration measure.
In: Journal of the Association for Information Science and Technology. 65(2014) no.10, S.20522054.
(Brief communication)
Abstract: It is shown that a normalized version of the gindex is a good normalized impact and concentration measure. A proposal for such a measure by Bartolucci is improved.
Themenfeld: Informetrie
Objekt: gindex

5Abramo, G. ; D'Angelo, C.A. ; Viel, F.: Assessing the accuracy of the h and gindexes for measuring researchers' productivity.
In: Journal of the American Society for Information Science and Technology. 64(2013) no.6, S.12241234.
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 nationalscale research assessments at the individual level, based on the following three different indexes: the hindex, the gindex, 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 20012005. The analysis quantifies the shifts in ranks that occur when researchers' productivity rankings by simple indicators such as the h or gindexes are compared with those by more accurate FSS.
Themenfeld: Informetrie
Objekt: gindex ; hindex ; FSS

6Visscher, A. De: Response to "remarks on the paper by a. De Visscher, 'what does the gindex really measure?' ".
In: Journal of the American Society for Information Science and Technology. 62(2013) no.9, S.19601962.
(Brief communications)
Anmerkung: Vgl.: Visscher, A. De: What does the gindex really measure?. In: Journal of the American Society for Information Science and Technology. 62(2011) no.11, S.22902293.
Themenfeld: Informetrie
Objekt: gindex

7Hovden, R.: Bibliometrics for Internet media : applying the hindex to YouTube.
In: Journal of the American Society for Information Science and Technology. 64(2013) no.11, S.23262331.
Abstract: The hindex can be a useful metric for evaluating a person's output of Internet media. Here I advocate and demonstrate adaption of the hindex and the gindex to the top video content creators on YouTube. The hindex for Internet video media is based on videos and their view counts. The hindex is defined as the number of videos with >=h × 10**5 views. The gindex 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 hindex and gindex better capture both productivity and impact in a single metric.
Themenfeld: Informetrie
Objekt: hindex ; gindex ; YouTube

8Schreiber, M.: Do we need the gindex?.
In: Journal of the American Society for Information Science and Technology. 64(2013) no.11, S.23962399.
(Brief communication)
Abstract: Using a very small sample of 8 data sets it was recently shown by De Visscher (2011) that the gindex 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 gindex.
Themenfeld: Informetrie
Objekt: gindex

9Egghe, L.: Remarks on the paper by A. De Visscher, "what does the gindex really measure?".
In: Journal of the American Society for Information Science and Technology. 63(2012) no.10, S.21182121.
(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 gindex and the Rindex can be close to the square root of the total number of citations, whereas this is not the case for the Aindex. Here the author confirms an assertion of De Visscher.
Themenfeld: Informetrie
Objekt: gindex

10Visscher, A. De: What does the gindex really measure?.
In: Journal of the American Society for Information Science and Technology. 62(2011) no.11, S.22902293.
(Brief communications)
Abstract: It was argued recently that the gindex 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 gindex 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 Rindex also has a tendency to follow total impact, leaving only the Aindex as a true measure of specific impact. The main difference between the gindex and the hindex is that the former penalizes consistency of impact whereas the latter rewards such consistency. It is concluded that the hindex is a better bibliometric tool than is the gindex, 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 gindex really measure?' ". In: Journal of the American Society for Information Science and Technology. 62(2013) no.9, S.19601962.
Themenfeld: Informetrie
Objekt: gindex

11Zhang, C.T.: Relationship of the hindex, gindex, and eindex.
In: Journal of the American Society for Information Science and Technology. 61(2010) no.3, S.625628.
(Brief communications)
Abstract: Of htype indices available now, the gindex is an important one in that it not only keeps some advantages of the hindex but also counts citations from highly cited articles. However, the gindex 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 gindex based approximately on the hindex and the eindex. If citations for a scientist are ranked by a power law, it is shown that the gindex can be calculated accurately by the hindex, the eindex, and the power parameter. The relationship of the h, g, and eindices presented here shows that the gindex contains the citation information from the hindex, the eindex, and some papers beyond the hcore.
Themenfeld: Informetrie
Objekt: hindex ; gindex ; eindex

12Abramo, G. ; D'Angelo, C.A. ; Viel, F.: ¬A robust benchmark for the h and gindexes.
In: Journal of the American Society for Information Science and Technology. 61(2010) no.6, S.12751280.
Abstract: The use of Hirsch's hindex 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 hindexes on a large scale for purposes of comparative evaluation. Scientists may succeed in calculating their own hindexes 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 gindexes of all Italian university researchers in the hard sciences over a 5year 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: hindex ; gindex

13Woeginger, G.J.: Generalizations of Egghe's gindex.
In: Journal of the American Society for Information Science and Technology. 60(2009) no.6, S.12671273.
Abstract: This paper introduces the generalized Eggheindices 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 wellknown gindex. The main contribution of the paper is a family of axiomatic characterizations that characterize every generalized Eggheindex in terms of four axioms.
Themenfeld: Informetrie
Objekt: gIndex

14Schreiber, M.: Fractionalized counting of publications for the gIndex.
In: Journal of the American Society for Information Science and Technology. 60(2009) no.10, S.21452150.
Abstract: L. Egghe ([2008]) studied the hindex (Hirsch index) and the gindex, counting the authorship of cited articles in a fractional way. But his definition of the gFindex for the case that the article count is fractionalized yielded values that were close to or even larger than the original gindex. Here I propose an alternative definition by which the gindex is modified in such a way that the resulting gmindex is always smaller than the original gindex. Based on the interpretation of the gindex as the highest number of articles of a scientist that received on average g or more citations, in the specification of the new gmindex the articles are counted fractionally not only for the rank but also for the average.
Themenfeld: Informetrie
Objekt: gindex

15Schreiber, M.: Revisiting the gindex : the average number of citations in the gcore.
In: Journal of the American Society for Information Science and Technology. 61(2010) no.1, S.169174.
Abstract: The gindex is discussed in terms of the average number of citations of the publications in the gcore, showing that it combines features of the hindex and the Aindex in one number. For a visualization, data of 8 famous physicists are presented and analyzed. In comparison with the hindex, the gindex increases between 67% and 144%, on average by a factor of 2.
Themenfeld: Informetrie
Objekt: gindex ; hindex

16Egghe, L.: ¬The influence of transformations on the hindex and the gindex.
In: Journal of the American Society for Information Science and Technology. 59(2008) no.8, S.13041312.
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 hindex and on the gindex. General formulae that describe this influence are presented. These are applied to the case that the sizefrequency function is Lotkaian (i.e., is a decreasing power function). We further show that the hindex of the transformed IPP belongs to the interval bounded by the two transformations of the hindex of the original IPP, and we also show that this property is not true for the gindex.
Themenfeld: Informetrie
Objekt: hindex ; gindex

17Egghe, L.: Mathematical theory of the h and gindex in case of fractional counting of authorship.
In: Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.16081616.
Abstract: This article studies the hindex (Hirsch index) and the gindex 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 gindexes, and we present inequalities (both upper and lower bounds) between these fractional h and gindexes 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 gindexes and show that they are not very different from the unweighted ones.
Themenfeld: Informetrie
Objekt: hindex ; gindex