Definició dels indicadors SJR i SNIP
Aquests indicadors vinculats a les revistes aporten una mesura sobre la visibilitat, l'impacte, etc. de la revista.
Més informació a la web d'Scopus.
Indicador SJR
Developed by Professor Félix de Moya, Research Professor at Consejo Superior de Investigaciones Científicas, 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 has a direct effect on the value of a citation.
- Is weighted by the prestige of the journal, thereby ‘leveling the playing field’ among journals
- Eliminates manipulation: raise the SJR ranking by being published in more reputable journals
- ‘Shares’ a journal’s prestige equally over the total number of citations in that journal
- Normalizes for differences in citation behavior between subject fields
It expresses the average number of weighted citations received in the selected year by the documents published in the selected journal in the three previous years, --i.e. weighted citations received in year X to documents published in the journal in years X-1, X-2 and X-3.
Font: Web de SCImago
Indicador SNIP
Created by Professor Henk Moed at CTWS, University of Leiden, Source Normalized Impact per Paper (SNIP) measures contextual citation impact by weighting citations based on the total number of citations in a subject field. The impact of a single citation is given higher value in subject areas where citations are less likely, and vice versa.
- Measures contextual citation impact by ‘normalizing’ citation values
- Takes a research field’s citation frequency into account
- Considers immediacy - how quickly a paper is likely to have an impact in a given field
- Accounts for how well the field is covered by the underlying database
- Calculates without use of a journal’s subject classification to avoid delimitation
- Counters any potential for editorial manipulation
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