These terms (Cited half-life, Immediacy Index, Eigenfactor, Article Influence) are used by Researchgate to measure the impact of any article uploaded on their system. They are also used to rate the journal where such articles are published. But what does each symbolizes and how are they all measured?
Cited half-life is the median age of the articles that were cited in Journal Citation Reports each year. A citation’s age is equal to the publication year of the citing item (i.e., JCR year) minus the publication year of the cited item.
Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. The aggregate Immediacy Index indicates how quickly articles in a subject category are cited.
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. A journal's Eigenfactor score is measured as its importance to the scientific community.
Article Influence Score measures the relative importance of the journal on a per-article basis. It is the journal's Eigenfactor Score divided by the fraction of articles published by the journal.
Cited half-life is the median age of the articles that were cited in Journal Citation Reports each year. A citation’s age is equal to the publication year of the citing item (i.e., JCR year) minus the publication year of the cited item.
Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. The aggregate Immediacy Index indicates how quickly articles in a subject category are cited.
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. A journal's Eigenfactor score is measured as its importance to the scientific community.
Article Influence Score measures the relative importance of the journal on a per-article basis. It is the journal's Eigenfactor Score divided by the fraction of articles published by the journal.
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