About the CitImpact Scoring
CitImpact is the score of a given publication determined via our algorithms and taking into account:
- The Journal Impact Factor, 5-Year Journal Impact Factor, the Eigenfactor score, the Article Influence score.
- The number of citations and their influence determined by the same metrics above.
Impact Factor (from Web of Knowledge)
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. The citing works may be articles published in the same journal.
However, most citing works are from different journals, proceedings, or books indexed by Web of Science.
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 caclulated by dividing the number of citations in the JCR year by the total number of articles published in the five previous years.
Eigenfactor® Metrics (from Web of Knowledge)
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.
You can learn more about Eigenfactor Score and Article Influence Score at www.eigenfactor.org.
The Eigenfactor Score calculation is based on the number of times articles from the journal published in the past five years have been cited in the JCR year, but it also considers which journals have contributed these citations so that highly cited journals will influence the network more than lesser cited journals.
References from one article in a journal to another article from the same journal are removed, so that Eigenfactor Scores are not influenced by journal self-citation.
Article Influence Score
The Article Influence determines the average influence of a journal's articles over the first five years after publication. It is calculated by dividing a journal’s EigenfactorScore by the number of articles in the journal, normalized as a fraction of all articles in all publications.
This measure is roughly analogous to the 5-Year Journal Impact Factor in that it is a ratio of a journal’s citation influence to the size of the journal’s article contribution over a period of five years.
The mean Article Influence Score is 1.00. A score greater than 1.00 indicates that each article in the journal has above-average influence. A score less than 1.00 indicates that each article in the journal has below-average influence.