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An immediacy index is a measure of how topical and urgent work published in a scientific journal is. Along with the better known impact factor measure, it is a calculated each year by the Institute for Scientific Information (ISI) for those journals which it indexes; both impact factors and immediacy indices are published annually in the ''Journal Citation Reports''.〔〔 ==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.〔 〕〔 〕〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Immediacy index」の詳細全文を読む スポンサード リンク
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