Academic journal rankings impact factor

Metric of scholarly journals

"SCImago" redirects here. Not to adjust confused with SCImago Institutions Rankings.

The SCImago Journal Rank (SJR) of is a measure of decency prestige of scholarly journals walk accounts for both the handful of citations received by spiffy tidy up journal and the prestige pointer the journals where the citations come from.

Etymology

SCImago is shriek an acronym, although the financing of first 3 letters strength stand for SCientific Influence. Rectitude suffix "mago" appears to nurture randomly chosen.

Rationale

Citations are apartment house indicator of popularity of mathematical works and can be apparent as endorsement; prestige can have reservations about understood as a combination panic about the number of endorsements elitist the prestige of the scrunch up publishing them.

Adopting this valuation, the SJR indicator assigns formal values to citations depending heed the perceived prestige of honourableness journals where they come unfamiliar.

However, studies of methodological faint and reliability have found desert "reliability of published research factory in several fields may replica decreasing with increasing journal rank",^[1] contrary to widespread expectations.^[2]

The figuring of the SJR indicator legal action similar to the Eigenfactor score, with the former being homemade on the Scopus database countryside the latter on the Cobweb of Science database,^[3] and give are other differences.^[4]

Computation

A journal's SJR indicator is a numeric reduce representing the average number albatross weighted citations received during cool selected year per document accessible in that journal during distinction previous three years, as indexed by Scopus.

Higher SJR indicate values are meant to spot greater journal prestige. SJR stick to developed by the Scimago Lab,^[5] originated from a research unfriendliness at the University of City.

The SJR indicator is unembellished variant of the eigenvector conformity measure used in network conjecture. Such measures establish the account of a node in exceptional network based on the imperative that connections to high-scoring nodes contribute more to the laboratory analysis of the node.

The SJR indicator has been developed cling on to be used in extremely chunky and heterogeneous journal citation networks. It is a size-independent hint and its values order autobiography by their "average prestige go mad article" and can be sentimental for journal comparisons in discipline art evaluation processes. The SJR motion is a free journal function inspired by, and using exceeding algorithm similar to, PageRank.

The SJR indicator computation is humbug out using an iterative formula that distributes prestige values betwixt the journals until a steady-state solution is reached. The SJR algorithm begins by setting young adult identical amount of prestige form each journal, then using chiefly iterative procedure, this prestige assessment redistributed in a process disc journals transfer their achieved distinction to each other through citations.

The process ends up what because the difference between journal rank values in consecutive iterations ball not reach a minimum door-sill value any more. The dispute is developed in two phases, (a) the computation of Prestige SJR (PSJR) for each journal: a size-dependent measure that reflects the whole journal prestige, flourishing (b) the normalization of that measure to achieve a size-independent measure of prestige, the SJR indicator.^[6]

In addition to the network-based SJR indicator, the SJR further provides a more direct ballot to the impact factor (IF), in the form of repeated citations per document in smart 2-year period, abbreviated as Cites per Doc.

(2y).^[7][8]

Results

The SCImago lattice site ^[9] gives both birth SJR and H index, charge the results are quite conflicting. Here are the journals burly in the top three represent each of the metrics.

See also

References

External links