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A complete pic-ture of impact for individual researchers and journals requires using multiple measures and does not fully capture all aspects of influence. There are only a few players in the scholarly publishing world that collect data on article citations: Clarivate Analytics, Elsevier, and Google Scholar (Table 1).
Over time, a number of measures have been developed to measure author and journal impact. These impact factor instruments are expanding and can be difficult to understand. The varying measures provide different perspectives and have varying strengths and weaknesses.
Consider a few of our highest impact scientific journals, such as New England Journal of Medicine (NEJM) and the Journal of the American Medical Association (JAMA). Publishing in these journals, or other high impact factor journals, can lead to significant changes in clinical practice and policy.
1 sty 2020 · The Journal Impact Factor (JIF) has been a long-time standard for representing the quality or “prestige” of a journal, but it appears to be losing its relevance.
In a given year, the IF of a journal is the average number of citations received per article published in that journal during the 2 preceding years. IFs are calculated each year by Thomson scientific for those journals that it indexes and are published in JCR ( http://www.thomsonreuters.
29 sie 2024 · Impact Factors are used to measure the importance of a journal by calculating the number of times selected articles are cited within the last few years. The higher the impact factor, the more highly ranked the journal. It is one tool you can use to compare journals in a subject category.
PubMed® comprises more than 37 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.
