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It was introduced in July 2011 by as part of their work on. No adjustments on prior purchases. Subscription-based databases such as and the provide automated calculators. The index is designed to improve upon simpler measures such as the total number of citations or publications. 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. This article is about the index of scientific research impact. We appreciate your interest in Publishers Clearing House.

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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. Thus, the true predictability of future h-index is much lower compared to what has been claimed before. 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. For the economic measure, see. From July 2011 have provided an automatically-calculated h-index and within their own profile.

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The index can also be applied to the productivity and impact of a as well as a group of scientists, such as a department or university or country. 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. However, this finding was contradicted by another study by Hirsch. Then, we look for the last position in which f is greater than or equal to the position we call h this position. This method has not been readily adopted, perhaps because of its complexity. Each database is likely to produce a different h for the same scholar, because of different coverage. For example, if we have a researcher with 5 publications A, B, C, D, and E with 10, 8, 5, 4, and 3 citations, respectively, the h-index is equal to 4 because the 4th publication has 4 citations and the 5th has only 3.

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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. Get excited for exclusive deals, trend alerts, first access to our new collections, and more. Biochemical and Biophysical Research Communications. 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. It is possible to try the predictions using an online tool.

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Journal of the American Society for Information Science and Technology. As these metrics are percentages, they are intended to give a qualitative description to supplement the quantitative h-index. It was found that the distribution of the h-index, although it depends on the field, can be normalized by a simple rescaling factor. Archived from on 5 May 2010. Unfortunately at this time we are unable to process international online transactions. .

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May not be redeemed for cash or cash equivalent and is not transferable. First we order the values of f from the largest to the lowest value. In-store products may vary and may differ from online. However, Hirsch noted that values of h will vary between different fields. Yes, email me my member rewards, special invites, trend alerts and more. The h-index is an that attempts to measure both the and of the of a or scholar.

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One can be easily convinced that ranking in coauthorship networks should take into account both measures to generate a realistic and acceptable ranking. Scientists with high h 2 upper percentages are perfectionists, whereas scientists with high h 2 lower percentages are mass producers. The three h 2 metrics measure the relative area within a scientist's citation distribution in the low impact area, h 2 lower, the area captured by the h-index, h 2 center, and the area from publications with the highest visibility, h 2 upper. This improvement can enhance the measurement sensitivity of the h-index. Among 36 new inductees in the National Academy of Sciences in biological and biomedical sciences in 2005, the median h-index was 57. Hirsch has demonstrated that h has high predictive value for whether a scientist has won honors like membership or the. Please keep in mind that under the official rules for Publishers Clearing House there are geographic limitations to entry into our promotions, contests and giveaways.

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The h-index has been applied to Internet Media, such as channels. In contrast, if the same publications have 25, 8, 5, 3, and 3 citations, then the index is 3 because the fourth paper has only 3 citations. In addition, specific databases, such as the database can automatically calculate the h-index for researchers working in. 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. The exclusion of conference proceedings papers is a particular problem for scholars in , where conference proceedings are considered an important part of the literature. It has been suggested that in order to deal with the sometimes wide variation in h for a single academic measured across the possible citation databases, one should assume false negatives in the databases are more problematic than false positives and take the maximum h measured for an academic. Of course this method does not deal with academic age bias.

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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. 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. 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. A successive Hirsch-type-index for institutions has also been devised. 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. 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. Beatles song H Half H Hardware H Hentai anime H High Risk H Hit Baseball H Hacker H Henry H Hell H Husband H Historical action code H Hospital H Hotel aviation letter code H Holy H Hundred H Hold baseball; relief pitcher stat H Honda H Hearts playing cards H Magnetic Field physics H Holder football H Harbor H Homo- Latin: human-taxonomic genus H Hungary International Auto Identification H Hyundai automobile brand H Hurricane s H Horizontal polarization H Humidity H Horn music H Hardness H Haze weather reports H Heer German H Hinge philately H Hexadecimal H Hologram Red Dwarf sitcom H Himalayan rabbit breed H Histamine H Planck's Constant 6.