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Scopus and Ei (Content Excerpted from Elsevier)

Common Indicators for Journal, Author and Institution Analytics

CiteScore: is used as a standard to help measure citation impact for journal articles, conference proceedings and book series. It it is similar to impact factor used in Web of Science. This metric counts the citations received in a year to the documents published in the previous three years, divided by the number of documents published in 3 years. 

e.g., a journal's CiteScore in 2020 = the citations it receives in 2020 to documents published from 2017 to 2019, divided by the number of documents published from 2017 to 2019 (indexed in Scopus)  CiteScore Metrics include these 7 metrics:

  1. CiteScore Percentile: indicates how a journal ranks relative to other journals in the same subject field. e.g., CiteScore Percentile of 98% means the journal is in the top 2% of its subject field. 
  2. CiteScore Tracker: forecasts a source’s performance for the upcoming year. e.g., CiteScore Tracker 2019 updates monthly basis until it is fixed as an annual score in spring 2020, then Scopus will start to provide a monthly view on CiteScore Tracker 2020.
  3. CiteScore Quartiles: bands of titles that have been grouped together because they occupy a similar position within their subject categories.
  4. CiteScore Rank(Rank Out Of): indicates the absolute position of a title in its field; e.g., 5th out of 30 journals in the category.
  5. Percentage Cited: the proportion of the documents considered in the denominator of the CiteScore calculation that have received at least 1 citation in the numerator
  6. Other indicators: Citation Count (numerator of CiteScore calculation), Document Count (denominator of CiteScore calculation) 

Notes:

  1. CiteScore is calculated annually, showing the average citations for a full calendar year.
  2. CiteScore Tracker calculation is updated monthy, giving a current indication of a journal's performance.
  3. CiteScore is a metric without field-normalization, thus should not be compared between subject fields (different citation practices across disciplines affect the values of the metric).
  4. Similar to JCR's Impact Factor, CiteScore is not field-normalized and should not be used to be compared between disciplines. 
  5. Unlike SJR, CiteScore does not consider the quality of citing journals. Unlike SNIP, CiteScore is not normalized for the subject field.

Read more about How are CiteScore metrics used in Scopus

SJR (SCImago Journal Rank): Inspired by the Google Page Rank algorithm, SJR is weighted by the prestige(quality, which is also determined by the number of citations) of a journal. SJR = Weighted citations divided by Number of published documents. SJR allows the user to compare journals regardless of their subject fields because it takes consideration of: quality of citing journals, different citation behavior across disciplines and self-citation. About SJR

SNIP (Source Normalized Impact per Paper): a weighted measure of contextual citation impact. SNIP = a source's average citation count per paper divided by the citation potential of this source's subject field. It considers a journal's likelihood of being cited, including:

  • Citing frequency: the frequency at which authors cite other papers in their reference lists
  • Immediacy: the speed at which citation impact matures
  • Database Coverage: the extent to which the database used in the assessment covers the field’s literature

SNIP allows direct comparison of journals across subject disciplines because citation impacts are normalized. The differences of journals’ SNIP are due to the quality of the journals but not the different citation behavior between subject fields.

Topic Prominence 
Topics are based on clustering the citation network of Scopus content. Each Topic Topic is a collection of documents with a common intellectual interest and can be large or small, new or old, growing or declining in momentum. A document can belong to only one Topic). As newly published documents are indexed, they are added to Topics using their reference lists. These Topics are powered by SciVal and are now displayed directly in Scopus on Document Record pages along their prominence percentile score. You can click on the Topic label on Document Record pages to explore the Topic or open it in SciVal for further analysis.

Calculating a Topic’s Prominence combines three metrics which indicate the momentum of the Topic.

  • Citation Count in year n to papers published in n and n-1
  • Scopus View Count in year n to papers published in n and n-1
  • Average Journal CiteScore for year n

Topics are then ranked by Prominence of these citation patterns, which indicates a Topic’s momentum in a field of study.  The development of Topic Prominence in Science is dynamically based upon extensive research and customer feedback.You can run a complete portfolio analysis to see which Topics your peers, competitors and benchmarking institutions are currently active in, and the related Topics of high momentum.  More on Topic Prominence

The Impact per Publication (IPP) is based on citations in one year to articles, reviews, and conference papers published in the preceding three years, divided by the number of articles, reviews, and conference papers published in those three years.

Field-Weighted Citation Impact (FWCI) score comes from the Scopus database and shows how the article's citation count compares to similar articles in the same field and timeframe. Field-Weighted Citation Impact is the ratio of the total citations actually received by the denominator’s output, and the total citations that would be expected based on the average of the subject field. You may view each article's FWCI at its full record page.  More on Field-weighted Citation Impact (FWCI)