New Impact Factor by Scopus
SNIP: Source Normalized Impact per Paper is based on Scopus citation database which is produced by Elsevier. The SNIP combines a journal’s average citation count per paper with the “citation potential” of its subject area, thereby enabling journals in different subject areas to be compared. SNIPs are available for papers listed in Scopus, so even your journal does not have an Journal IF it may well have a SNIP. It 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.
The SNIP indicator is defined as the quotient of two other indicators: (i) the journal’s Raw Impact per paper published in the journal (RIP) divided by (ii) the Relative Database Citation Potential (RDCP) in the journal’s sub-field. The numerator, that is, the journal’s Raw Impact per paper published in the journal, is not essentially different from a three-year Impact Factor. The denominator of the SNIP, that is, the Relative Database Citation Potential is defined with reference to the median of the Database Citation Potentials of the journals in the database.
SCImago Journal Rank (SJR): SJR takes prestige into account when considering the value of a citation. A citation from high profile journal is valued above a citation from a lesser-known journal. It is a measure of the scientific influence or prestige of a journal. The SJR metric is based on Google PageRank™ algorithm. It measures the weighted citations per document. Citations are weighted depending on the prestige of the source where they originate. SJR is a prestige metric based on the idea that ‘all citations are not created equal’. A SJR value of 1.5 in a given year means that the research article published in the journal in the three previous years received, on average, one and a half weighted citations.
Metrics are useful as they are a means of providing information about research quality and impact of publications. These metrics can be used to track record when applying for grants and promotion. The University Grants Commission (UGC) focuses publications in SCI journals with impact factor and number of citations of publications for academic evaluations. The NAAC (National Assessment and Accreditation Council) assesses research areas of academic institution based on publications in impact factor journals and various other citation metrics including SNIP and SJR.