Tag Archives: Impact Factor

Journal Impact Factors 2014: Just released

The latest journal impact factors was released last week and is now accessible on Journal Citation Reports.

JCR 2014 provides impact factors to more than 11,000 journals, of which 272 titles have been added for the first time. New titles include:

Analysis and Mathematical Physics
Biology Open
Biomaterials Science
BMC Ecology
BMC Pharmacology and Toxicology
Discussiones Mathematicae Graph Theory
FEBS Open Bio
Foundations of Chemistry
Green Processing and Synthesis
Journal of Applied Analysis and Computation
Journal of Materials Chemistry A, B, C
Journal of Spectroscopy
Journal of Visualized Experiments (JoVE)
Nanotechnology Reviews

New indicators have been introduced :
1. Journal Impact Factor Percentile
2. Percent Articles in Cited Items (proportion of articles in non-review journals)

39 titles have been suppressed due to “anomalous citation patterns” (ie. self citations or citation stacking).

If you would like to find out more about impact factors or citation analysis, please contact your subject librarians or email scholarlycomm@ntu.edu.sg

Journal Citation Reports (JCR) 2013

The Journal Citation Reports (JCR) 2013, which provides impact factor of more than 11,000 publications, are now available.

1. Titles appearing for the first time in JCR Science edition  include,  ACS Macro Letters, Advances in Optics & Photonics,  Chinese Medicine, Earth System Dynamics,  ECS Solid State Letters, IEEE Transactions on Smart Grid, International Journal of Geomechanics, Journal of Computational Science. Journal of Transportation Engineering.

2. Titles appearing for the first time in JCR Social Science edition include, Economic Systems, English Today, Frontiers in Psychology, International Journal of Sport and Exercise Psychology, International Review of Finance, Journalism, Law & History Review.

Refer to Thomson Reuters for the full list of titles covered in JCR 2013.
For NTU staff and students, you can access JCR at http://ezlibproxy1.ntu.edu.sg/login?url=http://isiknowledge.com/jcr or from the Library Database page at http://www.ntu.edu.sg/library/databases

journal citiation

Journal Impact Factor

Impact Factor of an academic journal is frequently used as a proxy for the relative importance of a journal within its field.  Impact factors for science and social science journals are from Journal Citation Report (JCR), a product of Thomson Reuters.

Journal Impact Factor is calculated based on a three-year period. For example, the impact factor of a journal for 2012 would be calculated as follows:


An impact factor of 1.0 means that, on average, articles published one or two years ago have been cited one time. The higher the impact factor, the more prestigious the journal is considered to be.

To provide a broader range of citation activity, JCR produces 5-year Impact Factor in the report:


JCR also provides Immediacy Index which indicates how quickly articles in a journal are cited. It is calculated by dividing the number of citations to articles published in a given year by the number of articles published in that year. For example:


NTU Libraries subscribed to the Journal Citation Reports. Users can choose to view the citation report of a specific journal or a group of journals in a subject field. The screenshot below shows the citation report of journals in Mathematics subject category for 2011, sorted by Impact Factor. In this report, Journal of the American Mathematical Society (J Am MATH SOC) has the highest Impact Factor of 3.841. The 2nd high impact journal is Foundations of Computational Mathematics (FOUND COMPUT MATH), and its Impact Factor is 3.615. ACTA Mathematica (ACTA MATH-DJRSHOLM) with the Impact Factor of 3.333 is ranked the 3rd in the list.

JCR (1)