Some days ago, William Gunn, Head of Academic Outreach for Mendeley, tweeted about the availability of the latest Journal Metrics.
The experimental web application of (alt)metrics on our publications since 2007 includes now
- Source Normalized Impact per Paper (SNIP) 2013
- Impact per Publication (IPP) 2012 and 2013
- SCImago Journal Rank (SJR) 2012 and 2013
The number of years is solely a matter of layout; the table in the Data tab has so many columns already that you need to scroll horizontally to see them all, and that’s a pain. AFAIK the values in SNIP 2012 and SNIP 2013 are identical, so I left out the previous year.
Short excerpts from the web page of respective metrics (bolding is mine):
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.
The IPP measures the ratio of citations in a year to scholarly papers published in the three previous years divided by the number of scholarly papers published in those same years. The IPP is not normalized for the subject field and therefore gives a raw indication of the average number of citation a publication published in the journal will likely receive.
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
While at it, I also added the possibility of filtering publications by School when all items are visible, i.e. nothing is selected from the Title nor Journal.
Please note that the citation count in this app comes from the Web of Science (WoS), not from Scopus.