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The impact factor (IF) or journal impact factor (JIF) of an academic journal is a scientometric index calculated by Clarivate that reflects the yearly mean number of citations of articles published in the last two years in a given journal, as indexed by Clarivate's Web of Science.
A journal's SJR indicator is a numeric value representing the average number of weighted citations received during a selected year per document published in that journal during the previous three years, as indexed by Scopus. Higher SJR indicator values are meant to indicate greater journal prestige.
This gives those papers more time to gather citations. Several methods, not necessarily with nefarious intent, exist for a journal to cite articles in the same journal which will increase the journal's impact factor. [42] [43] Beyond editorial policies that may skew the impact factor, journals can take overt steps to game the system.
A study published in 2021 compared the Impact Factor, Eigenfactor Score, SCImago Journal & Country Rank and the Source Normalized Impact per Paper, in journals related to Pharmacy, Toxicology and Biochemistry. It discovered there was "a moderate to high and significant correlation" between them. [25]
The journal was established in 2011. [1] The journal states that their aim is to assess solely the scientific validity of a submitted paper, rather than its perceived importance, significance, or impact. [2] In September 2016, the journal became the largest in the world by number of articles, overtaking PLOS ONE. [3] [4] [5]
As of 2023, Journal Citation Reports has given 15 Annual Reviews journal titles a rank of "1", indicating high quality and importance in one or more categories. The top five Annual Reviews titles by impact factor are: [74] Annual Review of Pathology: Mechanisms of Disease (36.2) Annual Review of Astronomy and Astrophysics (33.3)
Nature Reviews Materials is a monthly peer-reviewed scientific journal published by Nature Portfolio. It was established in 2016. [1] The journal covers all topics within materials science. It presents reviews and perspectives, which are commissioned by the editorial team. The editor-in-chief is Giulia Pacchioni. [2]
The journal is abstracted and indexed in: Science Citation Index Expanded [3] Scopus [4] According to the Journal Citation Reports, the journal has a 2021 impact factor of 37.214, ranking it 2nd out of 279 journals in the category "Environmental Sciences" [5] and 1st out of 201 journals in the category "Geosciences, Multidisciplinary". [6]