These days one gets a lot of e-mails from journals inviting papers promising fast publication (with review done in 2 weeks to one month time) and publication upon paying some publishing charges. These journals also try to attract authors by advertising that they have a high impact factor. A respected friend pointed out the case of a predatory journal attracting authors by boasting it has an impact factor over 5 after publishing just one volume.
Eminent friends - Kindly help researchers and scientists on how to check the claims of these journals about "impact factors". How is the impact factor calculated for a journal? Where can we check it for authentic information on indexed journals?
I know that Science Citation Index has a list of indexed journals. Scopus also gives impact factor of the journals it is indexing. Any further help is appreciated.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. For example, if a journal has an impact factor of 3 in 2008, then its papers published in 2006 and 2007 received 3 citations each on average in 2008. The 2008 impact factor of a journal would be calculated as follows:
2008 impact factor = A/B.
where: A is the number of times that all items published in that journal in 2006 and 2007 were cited by indexed publications during 2008. and B is the total number of "citable items" published by that journal in 2006 and 2007. ("Citable items" for this calculation are usually articles, reviews, proceedings, or notes; not editorials or letters to the editor).
(Note that 2008 impact factors are actually published in 2009; they cannot be calculated until all of the 2008 publications have been processed by the indexing agency.)
Plz refer to Wiki link below for further information.
P.S.: This question was asked by @Sharma Rao Balakrishnan in RG two years ago!
http://en.wikipedia.org/wiki/Impact_factor
https://www.researchgate.net/post/How_is_impact_factor_calculated
The SCI (Science Citation Index) of Thomson is the most trusted citation organization.
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. The annual JCR impact factor is a ratio between citations and recent citable items published. Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years
http://www.citefactor.org/journal-impact-factor-list-2014.html
http://wokinfo.com/essays/impact-factor/
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. For example, if a journal has an impact factor of 3 in 2008, then its papers published in 2006 and 2007 received 3 citations each on average in 2008. The 2008 impact factor of a journal would be calculated as follows:
2008 impact factor = A/B.
where: A is the number of times that all items published in that journal in 2006 and 2007 were cited by indexed publications during 2008. and B is the total number of "citable items" published by that journal in 2006 and 2007. ("Citable items" for this calculation are usually articles, reviews, proceedings, or notes; not editorials or letters to the editor).
(Note that 2008 impact factors are actually published in 2009; they cannot be calculated until all of the 2008 publications have been processed by the indexing agency.)
Plz refer to Wiki link below for further information.
P.S.: This question was asked by @Sharma Rao Balakrishnan in RG two years ago!
http://en.wikipedia.org/wiki/Impact_factor
https://www.researchgate.net/post/How_is_impact_factor_calculated
The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the year.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. An Impact Factor of 3.0 means that, on average, the articles published one or two year ago have been cited three times. Impact factor can be calculated also for the last five years.
I am with all the previous comments. However, many journal nowadays, conditioned for a paper to be publish in its journal to cite certain numbers of articles published in there journal. This means that their impact factors increased.
Well said by both.
What I want to say are that the impact factor is now so much manipulated and its integrity is affected.
Some journal editors 'encourages' authors to cited papers in their journals.
Editors-in-chies of 2 journals form a pact to cite papers of each other's journl.
One author registered several emails addresses with slightly different names and cite his own papers as if these are not self-citations.
Dear Huajiang, I experienced the invitation by Editors to cite articles of their journal in order to increase the impact factor. However, a mean value is stable, whilst a small score may change year by year. I think that H index which evaluates both imapct factor and citations is a better indicator of the scientific reputation of a researcher. But, the main question is: may an Editor promise a great increse of the impact factor of his journal within a certain period? The answer is: absolutely NO!
There are many types of impact factors. There are impact factor for journals, for articles, and for authors.
The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. An Impact Factor of 1.0 means that, on average, the articles published one or two year ago have been cited one time. An Impact Factor of 2.5 means that, on average, the articles published one or two year ago have been cited two and a half times. The citing works may be articles published in the same journal. However, most citing works are from different journals, proceedings, or books indexed by Web of Science.
Impact factor of a journal is an index based on the frequency with which a journal's articles are cited in scientific publications. In any given year, the impact factor of a journal is the average number of citations received per paper published in that journal during the two preceding years. It is derived by dividing the number of citations in year 3 to all articles published in the journal during preceding years 1 and 2 by the number of citable articles published in that journal in years 1 and 2.
Another metric for journal ranking is SJR.
SCImago Journal Rank 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 have a direct effect on the value of a citation. It is a size-independent indicator and it ranks journals by their 'average prestige per article' and can be used for journal comparisons in the scientific evaluation process.
The SCImago Journal & Country Rank is a portal that includes the journals and country scientific indicators developed from the information contained in the Scopus® database (Elsevier B.V.). These indicators can be used to assess and analyze scientific domains.
http://www.scimagojr.com/
A base of five years may be more appropriate for journals in certain fields because the body of citations may not be large enough to make reasonable comparisons, publication schedules may be consistently late, or it may take longer than two years to disseminate and respond to published works.
http://admin-apps.webofknowledge.com/JCR/help/h_fiveyr_if.htm
The journal Impact Factor gives information that how much important research papers of the Journal are...
Dear Colleagues,
Good Day,
Here is the definition of Impact factor:
The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year. The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years.
This question was asked here long time ago here (RG).
please, see the 4th link for that!! link 6th shows H-Index too,
7th link is a very nice paper regarding the thread!
link 8th is "How do I find the impact factor and rank for a journal?"
you could see the link for detail and more information:
https://en.wikipedia.org/wiki/Impact_factor
http://admin-apps.webofknowledge.com/JCR/help/h_impfact.htm
http://admin-apps.webofknowledge.com/JCR/help/h_fiveyr_if.htm
https://www.researchgate.net/post/How_is_impact_factor_calculated
http://wokinfo.com/essays/impact-factor/
http://researchguides.uic.edu/if
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC141186/
https://www.hsl.virginia.edu/services/howdoi/hdi-jcr.cfm
For the information only
Now the details about the calculation of impact factor for Elsevier journals is shown in the Journal Metrics as follows;
The average number of citation received in a particular year by papers published in the journal during the two preceding years.
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