Journal impact factor gets a sibling that adjusts for scientific field | Science | AAAS

“The new Journal Citation Indicator (JCI) accounts for the substantially different rates of publication and citation in different fields, Clarivate says. But the move is drawing little praise from the critics, who say the new metric remains vulnerable to misunderstanding and misuse….”

Journal Citation Indicator. Just Another Tool in Clarivate’s Metrics Toolbox? – The Scholarly Kitchen

“The JCI has several benefits when compared against the standard Journal Impact Factor (JIF): It is based on a journal’s citation performance across three full years of citation data rather than a single year’s snapshot of a journal’s performance across the previous two years. Clarivate also promises to provide the JCI score to all journals in its Core Collection, even those journals that do not currently receive a JIF score.

The JCI also avoids the numerator-denominator problem of the JIF, where ALL citations to a journal are counted in the numerator, but only “citable items” (Articles and Review) are counted in the denominator. The JCI only focuses on Articles and Reviews.

Finally, like a good indicator, the JCI is easy to interpret. Average performance is set to 1.0, so a journal that receives a JCI score of 2.5 performed two-and-a-half times better than average, while a journal with a score of 0.5 performed only half as well.

To me, JCI’s biggest weakness is Clarivate’s bold claim that it achieved normalization across disciplines….”

Introducing the Journal Citation Indicator: A new, field-normalized measurement of journal citation impact – Web of Science Group

“In a recent blog post we discussed refinements in this year’s forthcoming release of the Journal Citation Reports (JCR)™, describing the addition of new content and hinting at a new metric for measuring the citation impact of a journal’s recent publications.

I’m now pleased to fully introduce the Journal Citation Indicator. By normalizing for different fields of research and their widely varying rates of publication and citation, the Journal Citation Indicator provides a single journal-level metric that can be easily interpreted and compared across disciplines….”