Evaluating the scientific output: Bibliometric indicators

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Quartile / Percentile

Quartile rankings are derived for each journal in each of its subject categories according to which quartile of the IF distribution the journal occupies for that subject category.

Quartiles image

Quartiles are useful when applying for grants and assessment such as (National Agency for Quality Assessment and Accreditation of Spain, ANECA) or (Catalan University Quality Assurance Agency, AQU Catalonia). Quartiles are also useful when deciding best journals to publish.

The databases that offer this indicator are:

Impact factor (JIF) (JCR)

The Journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year.

Databases offering this indicator:

Journal Citation Indicator (JCI)

New JCR indicator for all journals included in the  Web of Science Core Collection:

  • Science Citation Index Expanded
  • Social Science Citation Index
  • Arts & Humanities Citation Index
  • Emerging Sources Citation Index

See the tutorial at Journal Citation Indicator Guide

Database offering this indicator:

CiteScore (SCOPUS)

Calculating the CiteScore is based on the number of citations to documents by a journal over four years, divided by the number of the same document types indexed in Scopus and published in those same four years.

Citeschore 2021 screen capture

Database offering this indicator: 


SJR indicator image

SNIP indicator image

Databases offering these indicators:

Immediacy index (JCR)

The Immediacy Index is the average number of times an article is cited in the year it is published.

  • The journal Immediacy Index indicates how quickly articles in a journal are cited.
  • The aggregate Immediacy Index indicates how quickly articles in a subject category are cited.

The Immediacy Index is calculated by dividing the number of citations to articles published in a given year by the number of articles published in that year.

Databases offering this indicator:


Eigenfactor logo

A journal's Eigenfactor score is our measure of the journal's total importance to the scientific community.

Main characteristics:

  • covers a period of five years
  • measures the importance of scholarly journals within the scientific community. 
  • a metric that rates journals on the basis of citations but gives higher weight to those citations coming from more influential journals.
  • this indicator is more qualitative than quantitative
  • Eigenfactor assigns journals to a single category
  • self-citations are not included.
  • Eigenfactor scores and article influence scores rank journals much as Google ranks websites.

The databases that offer this indicator areEigenfactor and Incites JCR (Incites Journal Citation Reports)

H-index (scholarly journals)

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.