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Judging Evidence Quality
SCImago Journal Rank (SJR)
Also called sjr, scimago
SCImago Journal Rank is a free, public ranking that sorts journals into quartiles (Q1 to Q4) based on citation data drawn from Scopus.
In context
You'll usually need this when you want a quartile ranking but don't have paid access to the database it's built from.
Why it matters
It gives a free, public quartile ranking (Q1 to Q4) for a journal, using Scopus data.