Citation and article counts are important indicators of how frequently current researchers are using individual journals. By tabulating and aggregating citation and article counts, JCR offers a unique perspective for journal evaluation and comparison.
Journal Citation Reports can show you the:
Table Definitions
1. Total Cites
The total number of citations to the journal in the JCR year.
2. Journal Impact Factor
The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. An Impact Factor of 1.0 means that, on average, the articles published one or two year ago have been cited one time. An Impact Factor of 2.5 means that, on average, the articles published one or two year ago have been cited two and a half times. Citing articles may be from the same journal; most citing articles are from different journals.
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3. 5-Year Journal Impact Factor
The 5-year journal Impact Factor is the average number of times articles from the journal published in the past five years have been cited in the JCR year. It is calculated by dividing the number of citations in the JCR year by the total number of articles published in the five previous years. The 5-year Impact Factor is available only in JCR 2007 and subsequent years.
4. Immediacy Index
The Immediacy Index is the average number of times an article is cited in the year it is published.
5. Half-Cited Life
The citing half-life is the median age of articles cited by the journal in the JCR year. Only journals that publish 100 or more cited references have a citing half-life. Cited-only journals do not have a citing half-life.
6. Eigenfactor Metrics
Like the Impact Factor, the Eigenfactor™ Score and Article Influence™ Score use citation data to assess and track the influence of a journal in relation to other journals. Eigenfactor™ Metrics are available only for JCR years 2007 and later.
· Eigenfactor Score
The Eigenfactor Score measures the number of times articles from the journal published in the past five years have been cited in the JCR year.