How can I measure a journal's quality?
Journals within a specific discipline are ranked according to their influence and impact. Some ranking schemes include metrics like Impact factors and citation data.
The impact factor is a measure of how frequently articles in a journal are cited. This can be included in EP as evidence of research impact.
Where do I find Journal ranking?
Some of the free sources are:
Scopus Journal Analyser a feature of the Scopus database that allows you to compare up to 10 journals from the 18,500 covered in Scopus. You can use it to find a journal's SCImago Journal rank, discussed below, Source Normalized Impact per Paper (SNIP) - it helps you make a direct comparision of sources in different subject fields.
SCImago Journal & Country rank is a publicly available portal that includes the journals and country scientific indicators developed from information contained in the Scopus database.
The EIGENfactor score of a journal sets out to measure its overall importance. Eigenfactor scores are intended to give a measure of how likely a journal is to be used, and to reflect how frequently an average researcher would access content from that journal.
European Reference Index for the Humanities (ERIH). Maintained by the European Science Foundation.
Journal Quality List. Maintained by Anne-Wil Harzing of the Unversity of Melbourne, this list is a compilation of rankings from a number of different sources in the fields of Economics, Finance, Accounting, Management, and Marketing.
Index Copernicus. Ranks scientific and medical journals