Journal ranking is widely used in academic circles in the evaluation of an academic journal's impact and quality. Journal rankings are intended to reflect the place of a journal within its field, the relative difficulty of being published in that journal, and the prestige associated with it. They have been introduced as official research evaluation tools in several countries.
Traditionally, journal ranking "measures" or evaluations have been provided simply through institutional lists established by academic leaders or through committee vote. These approaches have been notoriously politicized and inaccurate reflections of actual prestige and quality, as they would often reflect the biases and personal career objectives of those involved in ranking the journals; also causing the problem of highly disparate evaluations across institutions. Consequently, many institutions have required external sources of evaluation of journal quality. The traditional approach here has been through surveys of leading academics in a given field, but this approach too has potential for bias, though not as profound as that seen with institution-generated lists Consequently, governments, institutions, and leaders in scientometric research have turned to a litany of observed bibliometric measures on the journal-level that can be used as surrogates for quality and thus eliminate the need for subjective assessment
Consequently, several journal-level metrics have been proposed, most citation-based:
- Impact factor – Reflecting the average number of citations to articles published in science and social science journals.
- Eigenfactor – A rating of the total importance of a scientific journal according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals.
- SCImago Journal Rank – A measure of scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from.
- h-index – Usually used as a measure of scientific productivity and the scientific impact of an individual scientist, but can also be used to rank journals.
- Expert survey – A score reflecting the overall quality or contribution of a journal is based on the results of the survey of active field researchers, practitioners and students (i.e., actual journal contributors or readers), who rank each journal based on specific criteria.
- Publication power approach (PPA) – The ranking position of each journal is based on the actual publishing behavior of leading tenured academics over an extended time period. As such, the journal's ranking position reflects the frequency at which these scholars published their articles in this journal.
- Altmetrics – Rate journals based on scholarly references added to academic social media sites.
- diamScore – A measure of scientific influence of academic journals based on recursive citation weighting and the pairwise comparisons between journals.
- Source normalized impact per paper (SNIP) – a factor released in 2012 by Elsevier based on Scopus to estimate impact. The measure is calculated as SNIP=RIP/(R/M), where RIP=raw impact per paper, R = citation potential and M = median database citation potential.
- PageRank – In 1976 a recursive impact factor that gives citations from journals with high impact greater weight than citations from low-impact journals was proposed. Such a recursive impact factor resembles Google's PageRank algorithm, though the original Pinski and Narin paper uses a "trade balance" approach in which journals score highest when they are often cited but rarely cite other journals; several scholars have proposed related approaches. In 2006, Johan Bollen, Marko A. Rodriguez, and Herbert Van de Sompel also proposed replacing impact factors with the PageRank algorithm. The Eigenfactor is another PageRank-type measure of journal influence, with rankings freely available online, along with SCImago.
- JRank – JournalsRanking (JRank) is the digital portal developed by iMaQ Technologies Pvt. Ltd in 2015 containing list of all international journals indexed in ISI-JCR and Scopus-SJR based on the current impact factor (IF) and Quartiles (Q) given by Thomson Reuters and Scopus, respectively. The JRank also gives detailed information about the journal such as country of journal publishing, impact factor history, frequency of journal publishing, active web link etc. All lists of journals based on subjects can also be viewed using JRank portal
- h5-index – This metric, calculated and released by Google Scholar, is based on the h-index of all articles published in a given journal in the last five years.
Several national and international rankings of journals exist, e.g.:
- ERA Australia journal lists
- Brazil's Qualis
- Colombia's Publindex
- Finland's Julkaisufoorumi (JUFO)
- Norwegian Scientific Index
- Germany VHB Index; Link:  (economics)
- France CNRS ranking; Link:  (economics)
- Italian ANVUR ranking
- The Chartered Association of Business Schools' Academic Journal Guide
- List of HEC-Pakistan Recognized Journals
- Indian National Academy of Agricultural Sciences
They have been introduced as official research evaluation tools in several countries.
- Academic journal § Prestige and ranking
- Article-level metrics
- Author-level metrics
- Citation impact
- Impact factor
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