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The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
The Emerging Sources Citation Index (ESCI) is a citation index produced since 2015 by Thomson Reuters and now by Clarivate. According to the publisher, the index includes "peer-reviewed publications of regional importance and in emerging scientific fields". [1] The ESCI is accessible through the Web of Science, together with other Clarivate ...
Indexed by ISI Cancer Epidemiology, Biomarkers & Prevention collected an impact factor of 5.057 as reported in the 2018 Journal Citation Reports by Thomson Reuters, ranking it 48 out of 230 journals in the category Oncology [2] and ranking it 13 out of 186 journals in the category Public, environmental & occupational health. [3]
Clarivate [6] was formerly the Intellectual Property and Science division of Thomson Reuters.Before 2008, it was known as Thomson Scientific. [7] In 2016, Thomson Reuters struck a $3.55 billion deal in which they spun it off as an independent company, and sold it to private-equity firms Onex Corporation and Baring Private Equity Asia.
To quantitatively assess the output of a publishing company, in 2014 a research group associated with the University of Granada created a methodology based on the Thomson-Reuters Book Citation Index. [16] The quantitative weight of the publishers is based on output data, impact (citations) and publisher profile.
According to the Journal Citation Reports, the journal has a 2021 impact factor of 20.693, ranking it 2nd out of 37 journals in the "Virology" category. [4]
The impact factor was devised by Eugene Garfield, the founder of the Institute for Scientific Information (ISI) in Philadelphia. Impact factors began to be calculated yearly starting from 1975 for journals listed in the Journal Citation Reports (JCR). ISI was acquired by Thomson Scientific & Healthcare in 1992, [4] and became known as Thomson ISI.
According to the Journal Citation Reports, the journal has a 2017 impact factor of 2.078. [5] Conferences