The impact factor represents the average influence of a journal's articles, so it is an objective measure of the influence of the journal and probably also a good index of overall quality of its articles. Top 100 Impact Factor Journals of Science 2016 CIIT, Library Information Services, Islamabad. The impact factor for scientific journals is released around June every year by Thomson Reuters, the guru of scientific publication metrics. Impact Factor Calculations Here is the latest Impact Factor List of 2019 provided by the Journal Citation Report (JCR). The underlying assumption behind Impact Factors (IF) is that journals with high IF publish articles that are cited more often than journals with lower IF. An offshoot of citation analysis is Journal Impact Factor (JIF) which is used to sort or rank journals by their relative importance. All science journal editors wait for the new impact factor every year and if you are a publishing scientist you might have seen emails from at least some of the journals bragging on the improved impact factor. JCR was earlier published as Science Citation Index, and now it is published by Clarivate Analytics, a Web of Science Group. Impact factors may be used by: Journal Impact Factor or Impact Factor (IF) of an academic journal is a measure, calculated by the yearly average number of citations to recent articles published in that particular journal.. Impact Factor is the more valuable parameter among the academicians, in order to select the journal for publication.It also helps to identify the trustworthiness of the facts given in that journal. For this reason, the impact factors of journals cannot be compared in meaningful ways across disciplines, but a journal can be productively compared with other journals in the same JCR subject category to determine what a good impact factor for a journal in the category may be. This measure provides a ratio of citations to a journal in a given year to the citable items in the prior two years. 2020 Release of Journal Citation Reports. It contains over 12000 Journals. The Journal Impact 2019-2020 of Science is 20.570, which is just updated in 2020.Compared with historical Journal Impact data, the Metric 2019 of Science dropped by 12.88 %.The Journal Impact Quartile of Science is Q1.The Journal Impact of an academic journal is a scientometric Metric that reflects the yearly average number of citations that recent articles published in a given journal received. Journal Impact Factor. The 2020 Edition of the Journal Citation Reports® (JCR) published by Clarivate Analytics provides a combination of impact and influence metrics from 2019 Web of Science source data. Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years (see Figure 1). 1 Rank Journal Title ISSN Impact Factor 1 CA -A CANCER JOURNAL FOR CLINICIANS 0007 9235 187.040 2 NEW ENGLAND JOURNAL OF MEDICINE 0028-4793 72.406 3 NATURE REVIEWS DRUG DISCOVERY 1474-1776 57.000 4 CHEMICAL REVIEWS 0009-2665 47.928 Journal Impact Factor List 2019. The impact factor is useful in clarifying the significance of absolute (or total) citation frequencies.
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