Calculation
The immediacy index is calculated based on the papers published in a journal in a single calendar year. For example, the 2005 immediacy index for a journal would be calculated as follows:
- A = the number of times articles published by the journal in 2005 were cited in indexed journals during 2005
- B = the number of articles, reviews, proceedings or notes published by the journal in 2005
- 2005 immediacy index = A/B
As with the impact factor, there are some nuances to this: for example, ISI excludes certain article types (such as news items, correspondence, and errata) from the denominator.
Read more about this topic: Immediacy Index
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