October 18, 2012: Modified SJR
SCImago has introduced modifications to the SJR algorithm. The refined SJR, now called SJR2, recognizes the value of citations from closely related journals, compensates for an ever increasing volume of journals, and makes comparison easier with an average value equal to one.
Specific improvements to SJR include:
- Take into account the more prestigious nature of citations that come from within or closely related fields
- Overcome the tendency for prestige scores to diminish over time as the world-wide quantity of journals increases
- Offer a more readily understandable scoring scale with an average of 1 for easy comparison
Developed by Professors Félix de Moya, Research Professor at Consejo Superior de Investigaciones Científicas and Vicente Guerrero Bote at University of Extremadura, SCImago Journal Rank (SJR) is a prestige metric based on the idea that ‘all citations are not created equal’. With SJR, the subject field, quality and reputation of the journal have a direct effect on the value of a citation.
SJR is 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. It is a variant of the eigenvector centrality measure used in network theory. Such measures establish the importance of a node in a network based on the principle that connections to high-scoring nodes contribute more to the score of the node. The SJR indicator, which is inspired by the PageRank algorithm, was developed for extremely large and heterogeneous journal citation networks. It is a size-independent indicator and it ranks journals by their ‘average prestige per article’ and can be used for journal comparisons in science evaluation processes.
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- Research Paper: "The SJR indicator: A new indicator of journals' scientific prestige"
This is a paper by Professors Félix de Moya, Research Professor at Consejo Superior de Investigaciones Científicas and Vicente Guerrero Bote at University of Extremadura, published in the Journal of Informetrics. Read more
- SCImago website
From this site, you can find SJR values and related in-depth information about journals.