Journal impact factor is a measure reflecting the yearly average number of citations to recent articles published in that journal. It is frequently used as a proxy for the relative importance of a journal within its field.
IF is calculated as:
IF (year 2014)= Citations (year 2013)+Citations (year 2012)/Publications (year 2013)+Publications (year 2012)
I think (I am not sure, please re-check) if IF value for a journal is less than 0.01, the journal will not be considered as impact factor journal.
No, many of the scientific journals, and some have a distinctly scientific, have no impact factor.
Calculation of 2018 IF of a journal:
A = the number of times articles published in 2016 and 2017 were cited by indexed journals during 2018.
B = the total number of "citable items" published in 2016 and 2017.
A/B = 2018 impact factor
The term "IMPACT FACTOR" should legally and logically be used ONLY to the Impact Factor allotted by Thomson Reuters.
All other Impact Factors are used mainly by Predatory Journals just to cheat the young researchers.
Indexed journals are classified according to their Impact Factor (A-B-C..)
There are also non-indexed Journals.
Impact factor calculations vary annually.
Regards!
Not all journals have impact factors. Why? Because their published papers may not have been cited or their citations are significantly zero!
All journal in relation to contribution in literature ,philosophy ,Religion , Legal , Medical ,& also contributory ,scientific information are playing the fruitful part for the respective readers of their line .It is this contribution which may help the authors of respective areas to make their own review ,comments which may have certainly an impact of the valued readers of the concerned magazine .
This is my personal opinion
Dear Dr. Dickson Adom,
In the previous answer, I wrote about original IF.
But allotment of IF do not run in smooth path. There are many complains about regional preference during allotment of IF.
Your comment is wrong. Many journals are there without IF having a huge number of citations. Even in the citation, there are group mutual beneficial system (a group of researchers citate their article each other) and journal hosting citation system (the large journal hosting agencies take provisions to citate the articles published in any of their journals at maximum). The issue is not so simple!
All journals have an impact factor. Even an impact factor of 0 is still an impact factor, but should not be reported. Since it is a measure of citations (as Hadeel has pointed out), it is simply a function of the journal and its papers.
There are several reasons a journal may not have an impact factor listed.
The company Clarivate Analytics decides according to their criteria what journals are included in their databases (SCI, SSCI) to calculate their impact factor
all journal try to have impact factor, which is depends upon the yearly citations by researcher publish in other important journals.
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