It was found that the distribution of the h-index, although it depends on the field, can be normalized by a simple rescaling factor. Then, we look for the last position in which f is greater than or equal to the position we call h this position. 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. 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. It is, however, a feature of.
Journal of the American Society for Information Science and Technology. Tax, title, and license not included. A detailed study showed that the Web of Science has strong coverage of journal publications, but poor coverage of high impact conferences. Biochemical and Biophysical Research Communications. 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.
In addition, specific databases, such as the database can automatically calculate the h-index for researchers working in. 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. Are you looking for a blast of efficiency? 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. The h-index is intended to measure simultaneously the quality and quantity of scientific output. For the dialects lacking the aspiration, this meant a complication added to the standardized spelling. Thus, the true predictability of future h-index is much lower compared to what has been claimed before.
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. Journal of the American Society for Information Science and Technology. Retrieved 3 September 2016 — via Google Books. The form of the letter probably stood for a fence or posts. For example in le homard 'the lobster' the article le remains unelided, and may be separated from the noun with a bit of a glottal stop. This method has not been readily adopted, perhaps because of its complexity. 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 letter is silent in a , as in ah, ohm, dahlia, cheetah, pooh-poohed, as well as in certain other words mostly of French origin such as hour, honest, herb in but not and vehicle. Speakers could pronounce the h or not. It is possible to try the predictions using an online tool. 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. It was introduced in July 2011 by as part of their work on.
During the in the 1970s, the compromise was reached that h would be accepted if it were the first consonant in a syllable. Perhaps something in the middle is more your speed, like the. 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. 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. Harzing's Publish or Perish program calculates the h-index based on entries.
Tax, title, and license not included. Scientists with high h 2 upper percentages are perfectionists, whereas scientists with high h 2 lower percentages are mass producers. First we order the values of f from the largest to the lowest value. 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. Authorities disagree about the history of the letter's name.
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. Despite this increasing number, the pronunciation without the sound is still considered to be standard in England, although the pronunciation with is also attested as a legitimate variant. 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. The index works properly only for comparing scientists working in the same field; citation conventions differ widely among different fields. . 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.
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. In this context, the letter eta is also known as to underline this fact. Each database is likely to produce a different h for the same scholar, because of different coverage. This improvement can enhance the measurement sensitivity of the H-index. The haitch pronunciation of h has spread in England, being used by approximately 24% of English people born since 1982, and polls continue to show this pronunciation becoming more common among younger native speakers. We also have pre-owned options at our.
From July 2011 have provided an automatically-calculated h-index and within their own profile. In , during the 20th century it was not used in the orthography of the Basque dialects in Spain but it marked an aspiration in the North-Eastern dialects. One can be easily convinced that ranking in coauthorship networks should take into account both measures to generate a realistic and acceptable ranking. Wikimedia Commons has media related to. However, this finding was contradicted by another study by Hirsch.