The h index can be read from a decreasing graph of the number of citations per publication. The intersection of the falling graph with the line y = x gives the h-index. The first h publications are cited at least once in publications of others.
The Hirsch index or h-index is a subject-based index that measures the "career impact" of a scientific researcher's publications. However, other applications are also possible. The h-index was defined in August 2005 by physicist Jorge E. Hirsch in the scientific journal PNAS.
Hirsch defined the h-index as follows: A scientific researcher has index h if his or her total N publications are at least h cited in other publications, and the other (N-h) publications are no more than h cited.
According to Hirsch, this index provides a more realistic view of the scientific impact of one's publications than other figures such as the total number of publications (say nothing about the importance or impact), the total number of quotes (may be affected through a small number of highly-cited articles, such as review articles, or the number of quotes per article (favoring "lazy" authors who publish little).
Hirsch intended his index primarily for use in theoretical physics, but he found that she could also be useful in other subjects.
The h index can be determined by ordering an author's articles according to the number of quotes per article. These data can be obtained from, for example, the Web of Science, an online commercial database of scientific developed by the Institute for Scientific Information (ISI) and now part of Thomson Reuters. If the items get a serial number according to their number of quotes, the h index is the number of articles whose quotes are larger than their serial numbers. Example
An author published 7 articles and ranked them by order of the number of times they were cited.
There are therefore four articles (numbers 1 through 4) with at least 4 quotes and three (= seven to four) items with less than four quotes, h = 4.
The highest h-index among physicists (110) is Edward Witten. Another example is one of the recipients of the Nobel Prize for Chemistry of 2016, Ben Feringa, with a h index of 100. Also see Externe link
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