What are SCIs?
Science Citation Index (abbreviation: SCI) is a periodical literature retrieval tool that was put into use by the Institute for Scientific Information (ISI) in 1960. Its publication forms include printed periodicals and CD-ROM version and online database. The Science Citation Index is operated by Clarivate Analytics, which provides online reading and download services through the Web of Science database (one of the Web of Knowledge databases), allowing researchers to clearly know which new articles have been cited A document, or articles that have cited an author, and which articles are cited most often.
The larger version (Science Citation Index Expanded) includes more than 9,200 well-known and important journals from 1900 to the present, spanning 178 scientific fields. Because these journals adopt a strict screening process, they are recognized as the world's most authoritative top science and technology journals, which can provide the most important research results in the field of science and have considerable contributions and influence in the development of human civilization.
In countries around the world, in addition to evaluating the research capabilities of a university or academic institution, SCI journals are also listed as an important scoring item for whether researchers can be promoted and admitted.
How is the impact factor calculated?
First the formula:
JIF = total number of citations of papers in this year/total number of papers you published in the previous two years.
Example:
Take 2020 as an example:
If you published an SCI in 2022, and the total citations are 100, and you published a total of 20 papers in 2020 and 2021, then the impact factor of your SCI is: 100 / 20 = 5.
Impact factor: The calculation methods of the Chinese Academy of Sciences and JCR are different.
The impact factor of JCR is divided into four districts: District 1, District 2, District 3, and District 4. Among them, District 1 and District 2 belong to the top journals in this field.