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      The e-Index, Complementing the h-Index for Excess Citations

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      PLoS ONE
      Public Library of Science

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          Abstract

          Background

          The h-index has already been used by major citation databases to evaluate the academic performance of individual scientists. Although effective and simple, the h-index suffers from some drawbacks that limit its use in accurately and fairly comparing the scientific output of different researchers. These drawbacks include information loss and low resolution: the former refers to the fact that in addition to h 2 citations for papers in the h-core, excess citations are completely ignored, whereas the latter means that it is common for a group of researchers to have an identical h-index.

          Methodology/Principal Findings

          To solve these problems, I here propose the e-index, where e 2 represents the ignored excess citations, in addition to the h 2 citations for h-core papers. Citation information can be completely depicted by using the h-index together with the e-index, which are independent of each other. Some other h-type indices, such as a and R, are h-dependent, have information redundancy with h, and therefore, when used together with h, mask the real differences in excess citations of different researchers.

          Conclusions/Significance

          Although simple, the e-index is a necessary h-index complement, especially for evaluating highly cited scientists or for precisely comparing the scientific output of a group of scientists having an identical h-index.

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          Most cited references21

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          Is Open Access

          Does the h-index have predictive power?

          Bibliometric measures of individual scientific achievement are of particular interest if they can be used to predict future achievement. Here we report results of an empirical study of the predictive power of the h-index compared to other indicators. Our findings indicate that the h-index is better than other indicators considered (total citation count, citations per paper, and total paper count) in predicting future scientific achievement. We discuss reasons for the superiority of the h-index.
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            The state of h index research. Is the h index the ideal way to measure research performance?

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              The h index and career assessment by numbers.

              Growing demand to quantify the research output from public funding has tempted funding agencies, promotion committees and employers to treat numerical indices of research output more seriously. So many assessment exercises are now conducted worldwide that traditional peer assessment is threatened. Here, we describe a new citation-based index (Hirsh's h index) and examine several factors that might influence it for ecologists and evolutionary biologists, such as gender, country of residence, subdiscipline and total publication output. We suggest that h is not obviously superior to other indices that rely on citations and publication counts to assess research performance.
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                Author and article information

                Contributors
                Role: Editor
                Journal
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, USA )
                1932-6203
                2009
                5 May 2009
                : 4
                : 5
                : e5429
                Affiliations
                [1]Department of Physics, Tianjin University, Tianjin, China
                Université de Toulouse, France
                Author notes

                Conceived and designed the experiments: CTZ. Performed the experiments: CTZ. Analyzed the data: CTZ. Contributed reagents/materials/analysis tools: CTZ. Wrote the paper: CTZ.

                Article
                09-PONE-RA-09141
                10.1371/journal.pone.0005429
                2673580
                19415119
                b873b8c3-7364-44c9-abb9-f84d14076755
                Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
                History
                : 10 March 2009
                : 6 April 2009
                Page count
                Pages: 4
                Categories
                Research Article
                Science Policy
                Mathematics/Statistics
                Science Policy/Education

                Uncategorized
                Uncategorized

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