Journal Citation Reports (JCR) contains all the data required to understand the components that index the value and impact of each journal. JCR provides the following metrics:
- Impact Factor
- 5-year Impact Factor – is the average number of times articles from the journal published in the past five years have been cited in the last five years (citations to articles from the most recent five years, divided by the total number of articles from the most recent five years)
- Immediacy Index – is the average number of times articles from the journal published in the current year have been cited in the current year (citations to articles from the current year, divided by the total number of articles from the current year)
- Eigenfactor – similar to the 5-Year Journal Impact Factor, but weeds out journal self-citations.
- Article Influence – the Eigenfactor score divided by the number of articles published in the journal.
SCImago Journal & Country Rank (SJR) – is a publicly available tool that includes the journals and country scientific indicators based on the data in Scopus. These indicators can be used to assess and analyze scientific domains. Journals can be compared or analyzed separately. SJR provides the following metrics:
- SCImago Journal Rank (SJR) – measures the scientific influence of scholarly journals that account for both the number of citations received by a journal and the importance or prestige of the journals where the citations come from. This value is calculated by dividing the number of citations received by the journal in the given year from primary items to primary items published in the three previous years by the number of primary items published on the journal in the three previous years. See detailed description of SJR (PDF).
- H-Index – shows the journal’s number of articles (h) that received at least h citations. It quantifies both journal scientific productivity and scientific impact and it is also applicable to scientists, countries, etc. (see H-index wikipedia definition)
Scopus – is the largest abstract and citation database for peer-reviewed literature. It measures citation impact for journals, book series, conference proceedings and trade journals. Scopus provides the following metrics:
- CiteScore – the average citations per document that a title receives over a three-year period. CiteScore is the number of citations for a journal in one year to documents published in the three previous years, divided by the number of documents indexed in Scopus published in those same three years.
- SCImago Journal Rank (SJR)
- Source Normalized Impact per Paper (SNIP) – measures citations based on the number of citations in an academic field. If there are fewer citations per total in the specific research field, then every citation is considered more valuable.
Google Scholar Metric provides an easy way to quickly gauge the visibility and influence of recent articles in scholarly publications and provides the following metrics:
- h5-index is based on the articles published by a journal over 5 calendar years. h is the largest number of articles that have each been cited h times. A journal with an h5-index of 43 has published, within a 5-year period, 43 articles that each have 43 or more citations.
- h5-median is the median number of citations for the articles that make up its h5-index. The h index expresses the journal’s number of articles (h) that have received at least h citations. It quantifies both journal scientific productivity and scientific impact and it is also applicable to scientists, countries, etc. (see H-index Wikipedia definition).
MathSciNet – is the leading mathematics indexing and abstracting database that incorporates the content of the American Mathematical Society’s Mathematical Reviews.
The ‘Journals tab’ provides the ability to search for publications by name or ISSN. The results link to journal profiles that provide information about the publisher, previous journal names, dates of publication, and how it is indexed in MathSciNet. You will also find links to issues, articles and citation data.
The ‘Citations’ tab will search citation information for authors, journals, subject areas, and years.
There are also top 10 lists of the most cited journals by year.