WHAT ARE JOURNAL CITATION REPORTS?
JCR "is a report on the citation impact of a defined set of journals [published in Web of Science] at a given moment in time"
JCR "offers a systematic, objective means to critically evaluate the world's leading journals, with quantifiable, statistical information based on citation data." JCR looks at the impact of journals (JIF Journal Impact factor): "We capture the cited references for all content from these journals, and we link those cited references to the cited papers. This article-level citation data is aggregated to the journal-level at the end of the year to create the indicators available in JCR" (https://jcr.help.clarivate.com/Content/home.htm).
WHAT IS A GOOD JOURNAL IMPACT FACTOR (JIF)?
In most fields a JIF of 3 is considered good and over 10 excellent. The higher the impact factor the more highly ranked the journal is.
JIFs do however vary from discipline to discipline as the nature of publishing is different. One cannot really compare impact factors across different disciplines.
" The Journal Impact Factor™ (JIF) is defined as citations to the journal in the Journal Citation Reports™ (JCR) year to items published in the previous two years, divided by the total number of citable items, (i.e., Articles and Reviews) published in the journal in the previous two years." (Slide 6: https://clarivate.com/wp-content/uploads/dlm_uploads/2023/08/JCR-Reference-Guide-2023-August-update-1.pdf)
2022 citations from books, proceedings & journals (any material) in 2020, 2021
2022 JIF = -------------------------------------------------------------------------------------------------------------
number of articles and reviews published in a journal in 2020 and 2021