Journal Citation Reports 2013 Edition: Thomson Reuters

The 2013 Edition of Journal Citation Reports® (JCR) provides a combination of impact and influence metrics, and millions of cited and citing journal data points that comprise the complete journal citation network of Web of ScienceSM. The 2013 Edition of JCR includes;

- More than 10,800 of the world's most highly cited, peer reviewed journals in 232 disciplines
- Nearly 2,500 publishers and 83 countries represented 

- 379 journals receiving their first Journal Impact Factor

The recognized authority for evaluating journals, JCR presents quantitative data that supports a systematic, objective review of the world's leading journals.

source: JCR 2013 website

Quick Reference : Journal Citation Reports

Citing Half- Life

The citing half-life identifies the number of years from the current year that account for 50% of the cited references from articles published by a journal in the current year. Used together with the Cited Hal-Life, this number aids the evaluation of editorial policies.

Cited Journal Graph

This graph shows the distribution by cited year of citations to articles published in the selected journal.

Citing Journal Graph

This graph shows the distribution by cited year of citations from current year articles in the selected journal.

Source Data Table

The Source Data table provides information regarding the number of review articles versus original research articles that are published by a particular journal. This number also includes the number of references from a journal were not processed for inclusion in the citation indexes.

Citation Analysis part#3

A high volume of self-citation is not unusual or unwarranted in journals that are leaders in a field because of the consistently high quality of the papers they publish, and or because of the uniqueness or novelty of their subject matter. Ideally, authors reference the prior publications that are most relevant to their current results, independently of the source journal in which the work was published.

However, there are journals where the observed rate of self-citation is a dominant influence in the total level of citation. For these journals, self-citation has the potential to distort the true role of the tittle as a participant in the literature of its subject.

Eighty per cent of all journals listed in the JCR Science Edition have self-citation rates less than or equal to 20%. This shows that self citation is quite normal for most journals and id expected.

Significant deviation from this normal rate, however, prompts an examination by Thomson Reuters to determine if excessive self-citations are being used improperly, the journal's Impact Factor (IF) will not be published and the journal may be considered for deselection from the Web of Science.

What is Journal Selection Process?

Introduction:-


Thomson Reuters is committed to providing comprehensive coverage of the world`s most important and influential journals to meet its subscribers current awareness and retrospective information retrieval needs. Today Web of Science Cover over 9,000 international and regional journals and book series in every area of the natural sciences, social sciences,art and humanities. But comprehensive does not necessarily mean all-inclusive.




Why Be Selective?
It would appear that, in order to be comprehensive, an index to scientific journal literature might be expected to cover all the scientific journals published. This approach would be not only impractical economically, but as analyses of the scientific literature have shown, unnecessary. It has been demostrated that a relatively small number of journals publish the bulk of significant scientific results. This principle is often referred to as Bradford Law.


In the mid- 1930`s S.C Bradford realized that the core literature for any given scientific discipline was composed of fewer than 1,000 journals. Of these 1,000 journals, there are relatively few with a very strong relevance to the given topic, whereas there are many with a weaker relevance to it.


Those with a weak relevance to the given discipline or topic, however, typically have a strong relevance to some other discipline. thus, the core scientific literature can form itself around various topics, with individual journals becoming more or less relevant depending on the topic.


More recently an analysis of 7,528 journals covered in the 2005 JCR revealed that as few as 300 journals account for more than 50% of what is cited and more than 25% of what is published in them. A core of 3,000of these journals accounts for about 75% of published articles and over 90% of cited articles.






to be continued......