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TheSCImago Journal Rank (SJR) indicator is ameasure of the prestige ofscholarly journals that accounts for both the number ofcitations received by a journal and the prestige of the journals where the citations come from.
SCImago is not anacronym, although the capitalization of first three letters do stand for SCientific Influence. The suffix "mago" appears to be randomly chosen.[citation needed]
Citations are an indicator of popularity of scientific works and can be perceived as endorsement; prestige can be understood as a combination of the number of endorsements and the prestige of the works publishing them. Adopting this view, theSJR indicator assigns different values to citations depending on the perceived prestige of the journals where they come from.
However, studies of methodological quality and reliability have found that "reliability of published research works in several fields may be decreasing with increasing journal rank",[1] contrary to widespread expectations.[2]
The calculation of theSJR indicator is similar to theEigenfactor score, with the former being based on theScopus database and the latter on theWeb of Science database,[3] and there are other differences.[4]
A journal's SJR indicator is a numeric value representing the average number of weighted citations received during a selected year per document published in that journal during the previous three years, as indexed byScopus. Higher SJR indicator values are meant to indicate greater journal prestige.SJR is developed by the Scimago Lab,[5] originated from a research group at theUniversity of Granada.
The SJR indicator is a variant of theeigenvector 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 has been developed to be used in extremely large and heterogeneous journal citation networks. It is a size-independent indicator and its values order journals by their "average prestige per article" and can be used for journal comparisons in science evaluation processes. The SJR indicator is a free journal metric inspired by, and using an algorithm similar to,PageRank.
The SJR indicator computation is carried out using an iterativealgorithm that distributes prestige values among the journals until a steady-state solution is reached. The SJR algorithm begins by setting an identical amount of prestige to each journal, then using an iterative procedure, this prestige is redistributed in a process where journals transfer their achieved prestige to each other through citations. The process ends up when the difference between journal prestige values in consecutive iterations do not reach a minimum threshold value any more. The process is developed in two phases, (a) the computation ofPrestige SJR (PSJR) for each journal: a size-dependent measure that reflects the whole journal prestige, and (b) the normalization of this measure to achieve a size-independent measure of prestige, theSJR indicator.[6]
In addition to the network-based SJR indicator, the SJR also provides a more direct alternative to theimpact factor (IF), in the form of average citations per document in a 2-year period, abbreviated asCites per Doc. (2y).[7][8]
The SCImago web site[9] gives both the SJR and H index, and the results are quite different. Here are the journals ranking in the top three for each of the metrics.
| Title | SJR Rank | H Index Rank |
|---|---|---|
| Nature | 17 | 1 |
| Science | 56 | 2 |
| New England Journal of Medicine | 11 | 3 |
| Ca-A Cancer Journal for Clinicians | 1 | 621 |
| Foundations and Trends in Machine Learning | 2 | 10205 |
| Nature Reviews Molecular Cell Biology | 3 | 28 |
One might expect, therefore, that a high JIF factor indicates a higher standard of interest, accuracy and reliability of papers published therein. This is sometimes true but unfortunately is certainly not always the case (Brembs 2018, 2019). Thus, Björn Brembs (2019) concluded: "There is a growing body of evidence against our subjective notion of more prestigious journals publishing 'better' science. In fact, the most prestigious journals may be publishing the least reliable science."