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From article about SNIP – “Across a subject field as broad as scholarly communication, assessing journal impact by citations to a journal in a two-year time frame is obviously going to favor those subjects that cite heavily, and rapidly. Some fields, particularly those in the life sciences, tend to conform to this citation pattern better than others, leading to some widely recognized distortions.”
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From article: “Prestige measured by quantity of citations is one thing, but when it is based on the quality of those citations, you get a better sense of the real value of research to a community. Research Trends talks to Prof. FĂ©lix de Moya about SCImago Journal Rank (SJR), which ranks journals based on where their citations originate.”
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From article :Bibliometric indicators are not without their own controversies (1, 2) and recently there has been an explosion of new metrics, accompanying a shift in the mindset of the scientific community towards a multidimensional view of journal evaluation.”