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Hirsch's index: a case study conducted at the Faculdade de Filosofia, Ciências e Letras de Ribeir?o Preto, Universidade de S?o Paulo
Torro-Alves, N.;Herculano, R.D.;Ter?ariol, C.A.S.;Kinouchi Filho, O.;Graeff, C.F.O.;
Brazilian Journal of Medical and Biological Research , 2007, DOI: 10.1590/S0100-879X2007001100013
Abstract: an analysis of scientific bibliographic productivity using the hirsch h-index, information from the institute of scientific information database and the curriculum lattes (cnpq, brazil) was performed at the faculdade de filosofia, ciências e letras de ribeir?o preto, universidade de s?o paulo (ffclrp-usp) that has four departments in natural, biological and social sciences. bibliometric evaluations of undergraduate programs showed a better performance of the departments of chemistry (p < 0.001) and biology (p < 0.001) when compared to the departments of physics and mathematics and psychology and education. we also analyzed the scientific output of the six graduate programs of ffclrp: psychology, psychobiology, chemistry, physics applied to medicine and biology, comparative biology, and entomology. the graduate program in psychology presented a lower h-index (p < 0.001) and had fewer papers indexed by the isi web of science (p < 0.001) when compared to the other graduate programs. the poorer performance of the psychology program may be associated with the limited coverage by the thompson institute of scientific information database.
Scientific journals in the SciELO database, indicators of impact and the relative position of Ambiente & água
Nelson Wellausen Dias,Getulio Teixeira Batista
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2010,
Abstract: This editorial describes the process of periodic evaluation by CAPES, based on commercial indices proposed by companies such as the ISI FI by Thomson Reuters and SCImago by Scopus and public indices as proposed by SciELO and other freely calculated indices based on Google Scholar and investigates the impact position of the journal Ambiente & Agua compared with journals from the SciELO base. Results show that Ambiente & Agua is in the right path in the search for quality. Its editorial board strongly recommends that Brazilian public scientific agencies consider tools that are cost free and have large coverage for impact evaluation to allow the impact assessment of a range of emerging journals in a common and wide basis for all scientific journals.
Scientific Productivity of Zahedan University of Medical Sciences
Farahnaz Vatankhah
Zahedan Journal of Research in Medical Sciences , 2012,
Abstract: Background: Nowadays the scientific research outputs indexed in international databases are used in the bibliometric rankings of researchers, departments and universities. Measuring the impact and value of scientific publications is used by policy makers to distribute the research funds in way that support high quality research projects. Materials and Methods: In this scientometric study, SCOPUS citation database was used to evaluate the scientific research productivity of Zahedan University of Medical Sciences (ZAUMS) over the period of 1976-2011. We retrieved the number of publications and citations of researchers, academic groups, and university and calculated their h-index scores. The affiliation varieties were used by researchers to address the university and different spellings of authors names were determind.Results: The results showed that scientific productivity of ZAUMS has been improved so that it’s h-index increased from 1 in 2000 to 19 over the period of the study.Conclusion: Total number of 504 publications were indexed in SCOPUS in the forms of original article, review article, conference paper, letter, editorial, and note. Most of the publications were in the form of research article (91.2%). There was a significant coorelation between the number of publications, citation rates and h-index scores. Departments of biochemistry and infectious disease ranked first on the basis of producing the most scientific output of the university.
A Biologist’s Guide to Impact Factors
Michael S Rosenberg
PeerJ , 2015, DOI: 10.7287/peerj.preprints.477v1
Abstract: Personal impact factors (e.g., the h-index) are becoming more and more important in evaluations of faculty with respect to job hiring, promotion, and tenure, but they are largely poorly understood by the community at large. The purpose of this study is to educate biologist and other scientists about some of the wide literature about impact factors, including highlighting their strengths and weaknesses. This includes a thorough exploration of dozens of such indices by comparing how they perform through repeated calculation of data representing 15 years of scientific output of a single individual from beginning through mid-career. Indices are examined with respect to factors such as interpretability, consistency, and stability.
Gli indicatori bibliometrici: riflessioni sparse per un uso attento e consapevole Bibliometric indicators: spread reflections for a focusing and conscious use
Tessa Piazzini
JLIS.it , 2010, DOI: 10.4403/jlis.it-24
Abstract: The usage of bibliometric indicators is widespread in the scientific and academic world, and has become a standard in order to assign research funds and to assess the results of those investments. The aim of this article is to offer, without any claims for comprehensiveness some reflections and advices for using these tools in a more conscious way, highlighting their limits and peculiarities. Apart from Impact Factor, many tools related to Open Access have been developed recently. The most valuable options are given by Scimago, a free tool by the CSIC (Consejo Superior de Investigaciones Científicas), and Eigenfactor, research project of the the University of Washington. The H-Index (or Hirsch Index), developed in 2005 by professor Jorge E. Hirsch at the university of California, offers a valid option to the previous bibliometric analysis tools: the H-Index attempts to reduce some excesses of the Citation Index, making compliant very prolific but low quoted authors, with less prolific and high quoted ones. Nel mondo scientifico e accademico l'uso di indicatori bibliometrici è ormai largamente diffuso ed è diventato un parametro di giudizio per assegnare fondi di ricerca e valutare i risultati degli investimenti. Lo scopo di questo articolo è quello di fornire, senza alcuna pretesa di completezza, spunti di riflessione e consigli pratici per un utilizzo consapevole degli indicatori bibliometrici più consolidati, segnalandone i limiti e le peculiarità. Oltre al più noto e discusso indicatore bibliometrico, l'Impact factor, sono stati sviluppati negli ultimi anni alcuni sistemi alternativi legati all'open acess. Le più valide alternative sono rappresentate da Scimago, strumento gratuitamente consultabile on-line nato da un gruppo di ricerca del Consejo Superior de Investigaciones Científicas (CSIC) in collaborazione con alcune università spagnole e Eigenfactor, progetto di ricerca accademica non-commerciale sponsorizzato dal Bergstrom lab dell’Università di Washington. Molto affermato è infine l'H-index (o Indice di Hirsch), messo a punto nel 2005 da Jorge E. Hirsch professore all’Università della California di San Diego. Questo recente indice cerca di ridimensionare alcuni eccessi del Citation index, equilibrando e rendendo compatibili autori molto prolifici, ma con un basso numero di citazioni per articolo e studiosi meno produttivi, ma con un alto rapporto citazione/articolo.
A profile of the impact of Acta Botanica Brasilica: reflections on how to improve visibility and recognition of a scientific journal
Scarano, Fabio Rubio;De Toni, Karen;Amarante, Cristiana Vasconcellos Goulart;
Acta Botanica Brasilica , 2009, DOI: 10.1590/S0102-33062009000200032
Abstract: we have estimated the isi-impact factor of acta botanica brasilica for the past six years, calculated the journal's h-index, calculated the journal's self-citation, examined country and institutions of origin of the papers that cite acta papers, and examined scope and profile of the most-cited papers published by the journal. results demonstrated a steep rise in impact factor and citation frequency in 2008, which is most encouraging, but also revealed that the journal is below the level of maturity expected of a 20-year old journal. visibility of the journal is mostly national although, surprisingly, journal's self-citation of 12% is fairly low. we use acta as an example to discuss possible strategies to enhance the international visibility of botanical journals that are newcomers to isi.
H-index in the Brazilian Academy of Sciences: comments and concerns
Kellner, Alexander W.A.;Ponciano, Luiza C.M.O.;
Anais da Academia Brasileira de Ciências , 2008, DOI: 10.1590/S0001-37652008000400016
Abstract: bibliometric parameters have been used in order to evaluate a scientist's performance. the h-index has been gradually accepted as the most adequate parameter for this purpose. to have an idea of this index among brazilian scientists, we performed an analysis of this parameter for the full members of the brazilian academy of sciences (bas). the h-index of 402 members listed in 10 distinct categories by the bas was determined, cross-checked with the curriculum vitae of each of them listed at the plataforma lattes database (cvl) and compared with each other. despite the large production, mostly in journals without impact factor, the h-indexes among the bas members are comparatively low and show a large variation in all of the 10 categories, particularly in biomedical and physical sciences. the highest average of h-index values was found in biomedical, health and chemical sciences; the lowest values were found in human sciences where this index is meaningless. several problems due to the trend that new and "fresh" publications need be constantly produced (the "bakery-effect") are discussed. this study points to the need of developing countries such as brazil to invest in national scientific journals in order to make them gradually part of the mainstream journals. this would have a positive effect on bibliometric parameters of brazilian researchers, including the h-index.
El índice-I, un nuevo estimador del impacto de la productividad científica: Los ecólogos de Chile como caso de estudio
MOLINA-MONTENEGRO,MARCO A; GIANOLI,ERNESTO;
Revista chilena de historia natural , 2010, DOI: 10.4067/S0716-078X2010000200002
Abstract: hirsch proposed in 2005 the h-index, which integrates in a single number the impact of scientific output of a researcher, considering both the quantity of published articles and the citations received. it has been demonstrated that the number of coauthors in an article and the frequency of self-citations of the researcher may affect the scientific indices. in this study we propose a new indicator of the impact of scientific output: the i-index, which is based on the h-index, correcting for the number of coauthors of each article and the proportion of allo-citations of the researcher. in addition, we introduce the index's standardization by scientific age (time in years since the first publication, is-index). we evaluated the variation of i-index with chronological age (age classes), geographical location (santiago vs. regions) and gender of researchers. we also evaluated how these patterns vary if only the top ten of each age class are considered, and if the is-index is used. the sample group consisted of 120 researchers in ecological sciences (sensu lato). results show that older researchers have significantly higher i-index values and that this difference is greater when the top ten group is considered. researchers from santiago have higher i-index values than those from regions. however, the opposite trend is found when the top ten young researchers are considered. although no difference between male and female researchers was detected when the whole data set is considered, the top ten male researchers have greater i-index values. standardization of the i-index for scientific age changes the upper ranking of scientific output. the proposed index has the advantage of being an indicator that: i) better reflects the individual contribution of a researcher, ii) it is not feasible to manipulate it via self-citations, iii) it is not an integer number, hence allowing a more precise discrimination, and iv) the standardized version allows the comparison of the research ou
Journal Impact Revisited (Editorial)
Ulf-Dietrich Reips
International Journal of Internet Science , 2011,
Abstract: editorial, provides an example of calculating journal impact
Extreme inequalities of citation counts in environmental sciences
Deepthi Chimalakonda,Alex R Cook,L Roman Carrasco
PeerJ , 2015, DOI: 10.7287/peerj.preprints.265v1
Abstract: Well-established scientists are expected to be more likely to have their work recognised than early-career individuals and thus receive more citations. Estimating the degree of inequality in citation counts in environmental sciences can help identify the dynamics behind citation inequalities. Using the scientific profiles of researchers in the Google Scholar database, we estimated the inequality in the distribution of citations in the disciplines of evolutionary biology, conservation biology and ecology. The data were modelled using short-tailed (exponential) and long-tailed power-law (Pareto) distributions. The inequality in performance in each distribution was assessed using Gini coefficients. Citations counts per researcher presented Gini coefficients of 0.83–0.84, indicating extreme inequality. The results suggest that the reinforcement in citation counts due to seniority and previous success might be very strong. To produce meaningful comparisons of actual research impact using citation counts, factors such as lab size, collaborations or role in articles should ideally be controlled for.
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