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Citation Statistics / Analyses / Enhancements

Three NPG titles dominate multidisciplinary science category of the Thomson Reuters 2014 Journal Citation Report for second consecutive year
- 25 Jun 2015

Building on its established leadership in multidisciplinary publishing, Nature Publishing Group's (NPG) open access and interdisciplinary journal publishing programs are flourishing. The publisher says that open access, interdisciplinary and multidisciplinary research are all essential to accelerate progress, aid collaboration and meet the needs of the research community.

For the second year running, three NPG titles dominate the multidisciplinary science category of the Thomson Reuters 2014 Journal Citation Report, with Nature, Nature Communications and Scientific Reports ranking first, third and fifth respectively. Nature Communications also appears in the overall top 150 journals for the first time.

Journal Impact Factors indicate citation impact at a journal level, and are calculated from citations of papers published between 2012-13. NPG titles performed well across the board, with 16 Nature-branded titles occupying the top spot in their categories, and Nature remaining the world's most cited scientific journal with 617,363 citations in 2014. Nature also leads the multidisciplinary sciences category for the seventh consecutive year, with an impact factor of 41.456. The interdisciplinary Nature Climate Change now has an IF of 14.547, and NPG has announced its plan to launch Nature Energy in 2016.

Impact Factors are useful broad measures of average journal citation rates in comparison to others in their subject field, but they have their limitations and other metrics are also important. NPG journals also perform well when using these alternative metrics. For example Altmetric measures the general and social media activity around research papers. Articles from journals published by NPG accounted for nearly a quarter of the Altmetric Top 100 of 2014, with 24 articles making the list. Over 10 million visitors now regularly access nature.com each month, up over 20 percent over the last 2 years, further demonstrating the value of NPG's content to the scientific community.

While maintaining its focus on outstanding research, NPG has been rapidly expanding its open access options for authors with encouragement from most of the world's science funders. In 2014 44 percent of the research published by NPG was published open access and in 2015 this has now grown to exceed 50 percent. NPG is the first major publisher to pass this milestone and is committed to expanding its open science options to better meet scientists' needs.

Multi-disciplinary Open Access journal Nature Communications now has an Impact Factor of 11.470, up from 10.742 in 2014, with 26,346 citations in 2012/13. It is now counted among the 150 top-cited journals in the world. Last year, a statistical analysis of the articles published in Nature Communications, carried out by the Research Information Network (RIN) found that open access articles are viewed three times more often than articles that are only available to subscribers. RIN also found that OA articles are cited more than subscription articles.

Scientific Reports, NPG's fastest growing open access journal which publishes original research that is technically sound and scientifically valid, achieved an IF of 5.578 up from 5.078 and is now ranked as one of the top-cited 500 journals in the world for the first time.

In addition, Light: Science&Applications, an open access journal published in China by NPG, received its second IF of 14.603. This meant that the journal climbed from #4 to #2 in the optics category - second only to Nature Photonics.
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The Optical Society journal portfolio continue to lead in the Optics Category in new JCR rankings
- 23 Jun 2015

The Optical Society (OSA) has announced that its journal portfolio again leads the Optics category in the latest edition of the Journal Citation Reports® (JCR) (Thomson Reuters, 2015). Not only does OSA remain the foremost publisher in the field with the largest number of articles published (35%), but its high quality content also received the most citations (45%) of the 86 titles included in this year's Optics category.

OSA's comprehensive journal portfolio, accessible via the OSA Publishing Digital Library, received over 200,000 citations in 2014 and included 5 of the top 10 journals when ranked by total citations (Optics Express, Optics Letters, Applied Optics, Journal of Lightwave Technology and the Journal of the Optical Society of America A). Its title, Advances in Optics and Photonics, earned an Impact Factor of 10.111, a 5-Year IF of 18.565 and is ranked 3rd overall by Impact Factor in the Optics Category.

As a further reflection of the high quality science published by OSA, 12 out of 14 OSA journals saw an increase in their Impact Factor in this year's edition, and 8 OSA-owned and co-published journals are among the top 25 titles ranked by Impact Factor.
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Royal Society of Chemistry titles post impressive Impact Factors
- 22 Jun 2015

The Royal Society of Chemistry has announced that its journals portfolio has performed well across the board with Chemical Science, Chemical Society Reviews and Energy and Environmental Science seeing substantial rises in their Impact Factors.

Energy and Environmental Science, which launched in 2008, performed strongly with a 32.5 percent rise to an Impact Factor (IF) of 20.523. The journal continues to be the first in the Environmental Sciences category of the 2014 Journal Citation Report (JCR)* and comes in the top 5 percent of journals in all four of the ISI categories where it is listed.

Chemical Science showed continued IF development receiving 9.211, a 7.1 percent rise, ranking it 14 from 148 journals in the Chemistry, Multidisciplinary category. In January 2015, Chemical Science became a Gold Open Access journal.

Chemical Society Reviews saw an increase in IF to 33.383, ranked second in the Chemistry, Multidisciplinary category, while Chemical Communications received an IF of 6.834.

Journal of Materials Chemistry, which evolved into three journals: A, B and C in 2013, all received their first Impact Factors of A- 7.443, B-4.726 and C-4.696.

The 2014 JCR indicates the quality of content, and citation impact, across the RSC's titles. Other notable increases included Green Chemistry which saw a 17 percent increase to an IF of 8.020 and Physical Chemistry Chemical Physics, which launched in 1999, rose 7 percent to 4.493.
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Thomson Reuters releases 40th annual Journal Citation Reports, breaks new ground in journal evaluation
- 22 Jun 2015

The Intellectual Property (IP)&Science business of Thomson Reuters is changing the face of scholarly journal evaluation with the release of the 2015 Journal Citation Reports® (JCR) that includes the integration of a new metric, the Journal Impact Factor Percentile; a Normalized Eigenfactor®; detailed analysis of underlying journal level data; an Open Access (OA) Filter; and a variety of user updates that allow for increased transparency and easier access to a greater amount of data. The JCR claims to be the world's most influential resource for evaluating peer-reviewed publications and the source of the annual Journal Impact Factors (JIF).

Since 1975, the JCR has annually provided an assessment of a journal's standing in scholarly literature through the objective evaluation of statistical information. The 2015 release, with 2014 citation data for literature within the sciences and social sciences, features 11,149 journal listings in 237 disciplines; 82 countries are represented. A total of 272 journals received their first JIF; 53 percent of journals saw an increase in JIF from last year and 43 percent saw a decrease. Additionally, 39 journals were suppressed to ensure the integrity of the reports. Suppressed journals are re-evaluated after a year for reconsideration in the JCR.

Science Citation Index founder and father of bibliometrics, Dr. Eugene Garfield, worked with Alexander Pudovkin and a team of Thomson Reuters data scientists to develop a valuable new metric, Journal Impact Factor Percentile. A normalised journal impact factor provides percentile value allowing for a proper and meaningful comparison of journals across different categories.

Normalized Eigenfactor was developed by the Eigenfactor team at the University of Washington to offer greater clarity around the metric. For instance, if a journal's Normalized Eigenfactor is two, it is twice as influential as other journals within the area of study.

Supporting detailed analysis of underlying journal level data will allow users to download cited and citing data tables into an Excel file for greater transparency into the relationship between journals and the outcome of scholarship.

Another new feature, OA Filter, modeled after the Web of Science, will allow users to easily evaluate the performance of OA journals.

In addition to these noteworthy enhancements, the 2015 JCR offers an improved user experience with greater and simultaneous access to information in the sciences and social sciences; increased data transparency with easily accessible metrics to calculations for a specific journal; the integration of OA content into journal profiles; and, enhanced usability with customisable data grids, journal lists and comparison tools.

Now a module within Thomson Reuters InCites, an integrated web-based platform for measuring research output and impact, monitoring trends, and benchmarking articles, journals, institutions and people, the JCR comprises citation data, impact and influence metrics, and millions of cited and citing journal data points from the Web of Science. It also enables users to perform a comprehensive, rich and deep analysis and exploration of journals and the specific articles within a publication.

Thomson Reuters recently released new resources providing more insight into JCR and its new advancements, including the Heart of Research, an infographic illustrating the year-long process of building the JCR; and Innovations in Journal Evaluation, a webinar, scheduled for June 23, at 9 a.m. eastern.

Interested parties may register for the Innovations in Journal Evaluation event to learn more about new advancements to the JCR and follow @ImpactFactor on Twitter to stay up to date on the latest JCR news.
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Emerging nations closing gap on established leaders, reveals Nature Index
- 18 Jun 2015

China is stepping up its contribution to global high-quality research output year-on-year at the expense of the United States, Germany and the United Kingdom. This is according to the Nature Index 2015 Global supplement, published this week with Nature, that analyses data compiled by the Nature Index.

Overall, North America, North&West Europe, and East&Southeast Asia account for 91percent of the Index's weighted fractional count (WFC), a metric that apportions credit for research articles according to the affiliations of the contributing authors.

North America remains the world's most dominant region for high-quality scientific output in the most reputable journals. China has the second largest output in the Index with a WFC score of 6,037, only a third of the United States' count of 17,936. As ordered by WFC, China is number two behind the US and is followed by Germany, the United Kingdom and Japan. China's contribution grew 16 percent from 2013 to 2014, whereas contributions from each of the other top five countries decreased. Output from the US has fallen 3.5 percent. China's double digit growth is a sustained pattern, building on 14.9 percent growth from 2012 to 2013.

The Nature Index tracks the author affiliations of nearly 60,000 high-quality scientific articles published between 2012 and 2014. Analysis reveals clear regional research focus. The Nature Index 2015 Global supplement finds North America is dominant in the life sciences, highlights the contributions of Central&East Europe and West Asia in the physical sciences, and East&Southeast Asia's strengths in chemistry. North&West Europe and Australasia&Pacific Islands split their contributions relatively evenly amongst these broad subject areas.

International collaborations are another interesting finding of the Nature Index 2015 Global supplement. The majority of international collaborations in North&West Europe are with institutions within the same region (51 percent). Researchers in East&Southeast Asia tend to look further afield, with nearly three quarters of all collaborations occurring with institutions in North America (45%) or North&West Europe (18%). A future Nature Index supplement, planned for late 2015, will explore international research collaborations in more depth.

First launched in November 2014, the Nature Index uses three measures to track author affiliation data: article count (AC), the fractional count (FC) which takes into account the relative contribution of each author to an article, and WFC. WFC is used as the primary metric as it provides a more even basis for comparison and in determining the relative contribution of each country or institution.
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