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Journal metrics: handle with care

We have recently updated the journal metrics page for Nature Research to include an array of additional bibliometric data (www.nature.com/npg_/company_info/journal_metrics.html).  In addition to the traditional 2-year impact factor, we are now providing the 5-year impact factor, the immediacy index, the Eigenfactor score and the Article Influence Score. Whilst it is a measure that reflects a journal’s citations, the 2-year impact factor as an arithmetic mean of the citations per article can be disproportionately skewed by a minority of highly cited outliers.  Read more