Clarivate Analytics, the global leader in providing trusted insights and analytics to accelerate innovation, has announced the 2018 update of its Journal Citation Reports (JCR). The latest update incorporates new analyses that offer richer, more detailed information to enhance users' understanding of journal performance. These additional insights will help researchers, publishers, editors, librarians and funders to explore the key drivers of a journal's value for diverse audiences, making better use of the data and metrics from the citation index database.
The JCR claims to be the world's most influential and trusted resource for evaluating peer-reviewed publications and is the leading source of annual journal metrics and indicators, including the Journal Impact Factor (JIF). The reports comprise citation data, impact and influence metrics and indicators and more than 90 million data points in Web of Science.
The JCR relies on the core asset of the citation indexes (the same data the Web of Science is built on). This year, the JIF and other indicators have been significantly strengthened with article-level insights and a wide range of additional benefits. These include re-designed and enhanced journal profile pages to better understand the content, regions, and institutions that make a journal influential; document-level transparency for the JIF and new indicators to validate and understand the calculation of the JIF, and identify the contribution of different content types to journal citation performance and see the journals and articles that influence journal performance; Citation network expansion - Citations to JCR journals will now include the contribution of the Book Citation Index; and new contextual information which includes the addition of geographical data of authors and a list of top contributing institutions, demonstrates the global community of the publication.
The 2018 JCR comprise 11,655 journal listings across 234 disciplines. Eighty countries were represented. 276 journals received their first JIF. 20 journals were suppressed to ensure the integrity of the reports (14 for Journal Self-Citation, six for Citation Stacking). Suppressed journals are re-evaluated with each year's data update for re-listing in the JCR. Over 64 million references are reported in the JCR, with nearly 10 million in the JIF calculation alone. The inclusion of all references from the 2017 content of the Book Citation Index accounted for 1.2 million Science citations (118 k in the JIF), and 303 k Social Sciences Citations (18 k in the JIF). While the numerical contribution of these books is small, the expansion of the citation network reported is significant, showing how books and journals function as integrated resources in scholarly communication.
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