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However, this finding was contradicted by another study by Hirsch. Hirsch has demonstrated that h has high predictive value for whether a scientist has won honors like membership or the. Tax, title, and license not included. Tax, title, and license not included. Network editors receive the H-Announce daily digest and choose relevant content to repost to their networks. Journal of the American Society for Information Science and Technology.
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A value of about 18 could mean a full professorship, 15—20 could mean a fellowship in the , and 45 or higher could mean membership in the. Hi, To provide a more secure and pleasant fashion experience at hm. Biochemical and Biophysical Research Communications. Thus, the true predictability of future h-index is much lower compared to what has been claimed before. Journal of the American Society for Information Science and Technology. Of course this method does not deal with academic age bias.
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Total number of papers does not account for the quality of scientific publications, while total number of citations can be disproportionately affected by participation in a single publication of major influence for instance, methodological papers proposing successful new techniques, methods or approximations, which can generate a large number of citations , or having many publications with few citations each. Then, we look for the last position in which f is greater than or equal to the position we call h this position. However, later work has shown that since h-index is a cumulative measure, it contains intrinsic auto-correlation that led to significant overestimation of its predictability. The index was suggested in 2005 by , a physicist at , as a tool for determining ' relative quality and is sometimes called the Hirsch index or Hirsch number. The h-index serves as an alternative to more traditional journal metrics in the evaluation of the impact of the work of a particular researcher.
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For the economic measure, see. Offer subject to change or expire without notice. A scientific institution has a successive Hirsch-type-index of i when at least i researchers from that institution have an h-index of at least i. Are you looking for a blast of efficiency? It was introduced in July 2011 by as part of their work on. The index is based on the set of the scientist's most cited papers and the number of citations that they have received in other publications.
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We also have pre-owned options at our. Scopus has better coverage of conferences, but poor coverage of publications prior to 1996; Google Scholar has the best coverage of conferences and most journals though not all , but like Scopus has limited coverage of pre-1990 publications. It was found that the distribution of the h-index, although it depends on the field, can be normalized by a simple rescaling factor. From July 2011 have provided an automatically-calculated h-index and within their own profile. Scientists with high h 2 upper percentages are perfectionists, whereas scientists with high h 2 lower percentages are mass producers.
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Archived from on 5 May 2010. The h-index is an that attempts to measure both the and of the of a or scholar. To post an announcement directly to a , please visit that network and subscribe. The index works properly only for comparing scientists working in the same field; citation conventions differ widely among different fields. As these metrics are percentages, they are intended to give a qualitative description to supplement the quantitative h-index. One can be easily convinced that ranking in coauthorship networks should take into account both measures to generate a realistic and acceptable ranking. Not valid for purchase of gift cards or shipping.
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Each database is likely to produce a different h for the same scholar, because of different coverage. The index is designed to improve upon simpler measures such as the total number of citations or publications. This article is about the index of scientific research impact. Please note: Announcements are posted and distributed the same day they are moderated; however, daily digests are distributed the day after moderation. Tax, title, and license not included. It has been stated that citation behavior in general is affected by field-dependent factors, which may invalidate comparisons not only across disciplines but even within different fields of research of one discipline.
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It might be simpler to divide citation counts by the number of authors before ordering the papers and obtaining the h-index, as originally suggested by Hirsch. For example, the Meho and Yang study found that Google Scholar identified 53% more citations than Web of Science and Scopus combined, but noted that because most of the additional citations reported by Google Scholar were from low-impact journals or conference proceedings, they did not significantly alter the relative ranking of the individuals. To redeem in-store, print or show this banner on your smartphone. During the period January 1, 2000 — February 28, 2010, a physicist had to receive 2073 citations to be among the most cited 1% of physicists in the world. Tax, title, and license not included.
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If you don't have an account, please visit , then navigate back to H-Announce. Subscription-based databases such as and the provide automated calculators. A detailed study showed that the Web of Science has strong coverage of journal publications, but poor coverage of high impact conferences. Therefore, these disciplines have lower citation thresholds in the Essential Science Indicators, with the lowest citation thresholds observed in social sciences 154 , computer science 149 , and multidisciplinary sciences 147. 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.
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On average across the disciplines, a professor in the social sciences had an h-index about twice that of a lecturer or a senior lecturer, though the difference was the smallest in geography. However, Hirsch noted that values of h will vary between different fields. The h-index is intended to measure simultaneously the quality and quantity of scientific output. Numbers are very different in social science disciplines: The Impact of the Social Sciences team at found that social scientists in the United Kingdom had lower average h-indices. Among 36 new inductees in the National Academy of Sciences in biological and biomedical sciences in 2005, the median h-index was 57. For additional guidance, please refer to , located at the , or watch the. Perhaps something in the middle is more your speed, like the.
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