The annual Journal Citation Reports (JCR) provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The Impact Factor (IF) is one of these tools, measuring the frequency with which the average article in a journal has been cited in a particular year. The IF calculation is based on a two-year period and involves dividing the number of times qualifying articles were cited by the number of citable articles (see example below). The IF calculation eliminates some of the bias of total citation frequencies, which favor large over small journals and older journals over newer ones.
Calculating an Impact Factor
A = Total number of citations in 2016 to articles published in 2014-2015
B = Number of citable articles published in 2014-2015
Impact Factor = A/B
The Journal for ImmunoTherapy of Cancer (JITC) was accepted into the Science Citation Index Expanded (SCIE) in 2017. As a result, JITC will receive an Impact Factor in the 2018 JCR, which will be released in the summer of 2018. The Impact Factor will be based on the number of citations in 2017 for articles published in 2015-2016.
The Science Citation Index Expanded is a large citation index owned by Clarivate Analytics (previously the Intellectual Property and Science business of Thomson Reuters) that covers more than 9,000 notable journals from 150 disciplines. The SCIE provides researchers, administrators, faculty, and students with quick access to bibliographic and citation information. It is also widely utilized as a means of evaluation and promotion by academic and government research institutions worldwide. Every journal included in SCIE has met the high standards required by Clarivate Analytics for inclusion in this influential database.
While the Impact Factor remains the most widely used and recognized metric, there are a number of other metrics available to help measure quality of journals and the articles published within them. Two of the most frequently used metrics are explained below.
As seen on the article pages within JITC, the Altmetric Attention Score is an indicator of the degree of attention that an article has received across various professional and social media platforms. The score is derived from an automated algorithm, and represents a weighted count of the amount of attention picked up for a given publication. It is weighted to reflect the relative reach of each source. Examples of sources include news outlets, social media, and blogs. It's easy to understand why the average news article is likely to impact a wider audience than the average tweet. This reasoning is reflected in the default weightings.
The SJR – SCImago Journal Rank Indicator indicates the visibility of journals contained in the Scopus® database since 1996. The calculations are complex to provide the greatest differentiation between similarly themed journals.
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