What other metrics are available for journals in my area?

JCR provides additional metrics relating to individual journals. These include the 5-year Impact Factor which is based on citation counts to papers published in a journal over a five year period instead of the normal two years in the traditional impact factor. This is considered useful as in some fields it takes longer than two years for citations to appear. Another useful metric is the Immediacy Index number. This number represents the average number of times a paper is cited in the year in which it is published. This is useful when looking at journals which cover cutting-edge research.

What do the headings mean?

  • Total cites: The number of times journal articles published in that year cited articles published in each listed journal.
  • 5-year impact factor: this is calculated similarly to the traditional 2-year impact factor but uses a 5-year rather than a 2-year window. A base of five years may be more appropriate for journals in certain fields because the body of citations may not be large enough to make reasonable comparisons, publication schedules may be consistently late, or it may take longer than 2 years to disseminate and respond to published works.
  • Immediacy index: the immediacy index tells you how often artiicles published in a journal are cited during their year of publication. This can be an indication of how "hot" a journal is. 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.
  • Cited half life: the cited half life for a journal is the median age of its items cited in the current JCR year. Half of the citations to the journal are to items published within the cited half-life.This measures whether citing continues over time for a journal's content.
  • Eigenfactor: JCR links to the Eigenfactor metrics

From this same page you can also view data relating to the entire subject category you have selected. To view the aggregated metrics for a particular category simply click the View category summary list button.

Where do I get more information about using the JCR?

Creative Commons License

My RI by University College Dublin, Dublin City University, Dublin Institute of Technology, The National University of Ireland, Maynooth and the NDLR adapted by Marion Kelt, Glasgow Caledonian University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at http://www.ndlr.ie/myri/.