Controversial impact factor

Elsevier’s CiteScore uses a larger database — and provides different results for the quality of journals

Nature vol. 540 issue 7633 – by    Richard Van Noorden

One of science’s most contentious metrics has a flashy new rival. On 8 December, publishing giant Elsevier launched the CiteScore index to assess the quality of academic journals.

Although the index ranks journals with a formula that largely mimics the influential Journal Impact Factor (JIF), it covers twice as many journals — 22,000 to the JIF’s 11,000 — and its formula includes tweaks that produce some notably different results, including lower scores for some high-JIF journals. Read more

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