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GSL Publications and Citation Metrics

Scopus | Thomson Reuters' Web of Science/Web of Knowledge | Google Scholar | GeoRef | Citation Metrics | Impact Factor | h-index and h5-index | SJR | Cites per Doc (2y)/(3y)/(4y)

Where GSL publications are indexed

Scopus

All the journals published by the Society and all the book series in the Lyell Collection are included in Elsevier’s Scopus. Metrics based on Scopus data are available free of charge through the SCImago website. We have included SJR on our website, but other metrics are available on the SCImago site. Note that these metrics are not very helpful for irregularly-published book series like Memoirs and EGSPs.

Thomson Reuters’ Web of Science/Web of Knowledge

All the journals published by the Geological Society (including those published on behalf of other societies) are included in the Web of Science ‘Science Citation Index’.

Most of the books published by the Geological Society, including Special Publications, Memoirs, EGSPs and the TMS and IAVCEI series, are included in the Web of Science ‘Book Citation Index’ or the ‘Conference Proceedings Citation Index’. Both of these indexes allow authors to obtain citation counts for their articles and they accrue towards their h-index.

Authors should note that WoS data pertaining to their articles are only available via an institutional subscription. WoS is a modular product and their institution needs to have subscribed to the relevant components.

GoogleScholar

It is very easy to find Lyell Collection articles in GoogleScholar and citation counts are shown. Authors can register, which allows them to see their h-index and other information. Search for ‘Albert Einstein’ to see an example of an author profile. Using the ‘Metrics’ link you can find journal and book series h5-indexes, the most highly cited articles in that journal and which articles have cited them.

GeoRef

The Society’s publications are indexed by AGI for GeoRef. Special Publications and the Society’s four journals are all priority titles.

Citation metrics

Impact Factor

The impact factor is a measure of the frequency with which the ‘average article’ in a journal has been cited in a particular year or period, and is published annually by Thomson Reuter as part of the Journal Citation Reports (JCRs). The JCR only includes journals in the Science Citation Index and is therefore not available for books.  

The impact factor of a journal is calculated by dividing the number of current year citations to source items published in that journal during the previous two years. The 2010 IF is therefore:

2010 cites to articles published in 2008+2009
Number of articles published in 2008+2009

Five-year Impact Factors are also published in the Thomson Reuters’ JCR and are calculated in a similar way.

There is a helpful article about Impact Factors in European Science Editing February 2012 issue:
http://www.ease.org.uk/sites/default/files/essay_thorsten-krell.pdf

San Francisco Declaration on Research Assessment (DORA): The Impact Factor is widely misused as an indicator of article quality, and sometimes even of researchers. The Society is concerned about this and has signed this the San Francisco Declaration on Research Assessment:
http://www.ascb.org/files/SFDeclarationFINAL.pdf

UK academics should note that HEFCE is one of the original signatories.

h-index and h5-index

The h-index attempts to measure both the productivity and impact of the published work of an author. The index is based on the set of the author’s most cited papers and the number of citations that they have received in other publications. The index can also be applied to the productivity and impact of a research group or a scholarly journal. The index was suggested by Jorge E. Hirsch in 2005: http://www.pnas.org/content/102/46/16569.full.

An author has index h if h of his or her Np papers have at least h citations each and the other (Np−h) papers have ≤h citations each.

In other words, a scholar with an index of h has published h papers each of which has been cited in other papers at least h times. Thus, the h-index reflects both the number of publications and the number of citations per publication. The index works properly only for comparing scientists working in the same field; citation conventions differ widely among different fields.

An article about the h-index was published in the August 2011 issue of European Science Editing:
http://www.ease.org.uk/sites/default/files/eseaug11viewpointsbornmann.pdf.

The journal h-index expresses the journal's number of articles (h) that have received at least h citations. It quantifies both journal scientific productivity and scientific impact. However, this gives an unfair advantage to long-established journals. The h5-index, which is restricted to the last 5 years, is better for comparison purposes. The h5-index can be found in Google Scholar.

SJR

SJR, or SCImago Journal Rank, is a measure of the scientific prestige of scholarly sources.

SJR assigns relative scores to all of the sources in a citation network. Its methodology is inspired by the Google PageRank algorithm, in that not all citations are equal. A source transfers its own 'prestige', or status, to another source through the act of citing it. A citation from a source with a relatively high SJR is worth more than a citation from a source with a lower SJR.

A source's prestige for a particular year is shared equally over all the citations that it makes in that year; this is important because it corrects for the fact that typical citation counts vary widely between subject fields. The SJR of a source in a field with a high likelihood of citing is shared over a lot of citations, so each citation is worth relatively little. The SJR of a source in a field with a low likelihood if citing is shared over few citations, so each citation has a higher relative worth. The result is to even out the differences in citation practice between subject fields, and facilitate direct comparisons of sources.

SJR is similar to the WoS Eigenfactor, but it is publically available from SCImago

More information about SJR can be found at: http://www.sciencedirect.com/science/article/pii/S1751157710000246.

Cites per Doc (2y)/(3y)/4y)

This is a Scopus metric similar to the WoS Impact Factor. It is computed considering the number of citations received by a journal in the current year to the documents published in the two (or three or four) previous years, i.e. citations received in year X to documents published in years X-1 and X-2 (and X-3 and X-4 respectively for 3y and 4y). These are publically available from SCImago (http://www.scimagojr.com).

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