SCImago Journal Rank (SJR) Defined
SCImago Journal Rank (SJR) "is a measure of the scientific prestige of scholarly sources. SJR assigns relative scores to all of the sources in a citation network. Its methodology is inspired by the Google PageRank algorighm, in that not all citations are equal. A source transfers its own 'prestige', or status, to another source through the act of citing it. A citation from a source with a relatively high SJR is worth more than a cittion from a source with a lower SJR." http://www.journalmetrics.com/faq.php
Source Normalized Impact per Paper (SNIP) Defined
"Source Normalized Impact per Paper (SNIP) measures contextual citation impact by weithting citations based on the total number of citations in a submect field. SNIP is the ratio of a source's average citation count per paper, and the 'citation potential' of its subject field. It aims to allow direct comparison of sources in different subject fields." http://www.journalmetrics.com/faq.php
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