SJR measures both the number of citations received by a journal and the quality of the journals that the citations came from. This allows journals to be ranked according to the impact and prestige they have in their discipline. Academics can use SJR to find out which journals are most prestigious in their field and so where they might want to publish.
SJR was inspired by Google’s PageRank algorithm and assumes that not all citations are equal; that is, citations from prestigious sources boost the prestige of the journal cited. The data for the calculations is drawn from the SciVerse Scopus database and includes citations from the last three years. This measurement is similar to ISI impact factors.
NOTE: SCImago is run by a European research group. In Europe, number notation is done differently than in the United States. The comma is used to denote decimal place and periods are used for numbers over a thousand.
United States: 1,000.00
Gonzalez-Pereira, B., Guerro-Bote, V. and Moya-Anegon, F. The SJR indicator: A new indicator of journals' scientific prestige. Retrieved from: http://arxiv.org/ftp/arxiv/papers/0912/0912.4141.pdf