Tax, title, and license not included. 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. It was found that the distribution of the h-index, although it depends on the field, can be normalized by a simple rescaling factor. It is possible to try the predictions using an online tool. A detailed study showed that the Web of Science has strong coverage of journal publications, but poor coverage of high impact conferences.
Journal of the American Society for Information Science and Technology. 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. As these metrics are percentages, they are intended to give a qualitative description to supplement the quantitative h-index. 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. Hirsch has demonstrated that h has high predictive value for whether a scientist has won honors like membership or the.
Perhaps something in the middle is more your speed, like the. One can be easily convinced that ranking in coauthorship networks should take into account both measures to generate a realistic and acceptable ranking. First we order the values of f from the largest to the lowest value. It was introduced in July 2011 by as part of their work on. .
Are you looking for a blast of efficiency? Harzing's Publish or Perish program calculates the h-index based on entries. Journal of the American Society for Information Science and Technology. 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. The French orthography classifies words that begin with this letter in two ways, one of which can affect the pronunciation, even though it is a silent letter either way. Tax, title, and license not included.
Retrieved 3 September 2016 — via Google Books. 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. 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. External links has the text of the article. This article is about the index of scientific research impact.
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. 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. We also have pre-owned options at our. 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. 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. Tax, title, and license not included. 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.
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. However, this finding was contradicted by another study by Hirsch. For example, le + hébergement becomes l'hébergement 'the accommodation'. Tax, title, and license not included. 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. In addition, specific databases, such as the database can automatically calculate the h-index for researchers working in.
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. 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. This improvement can enhance the measurement sensitivity of the H-index. It is, however, a feature of. Authorities disagree about the history of the letter's name. Scientists with high h 2 upper percentages are perfectionists, whereas scientists with high h 2 lower percentages are mass producers.
Archived from on 5 May 2010. Wikimedia Commons has media related to. Speakers could pronounce the h or not. 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. Among 36 new inductees in the National Academy of Sciences in biological and biomedical sciences in 2005, the median h-index was 57.