For example, the impact factor 2010 for a journal would
be calculated as follows:
A = the number of times articles published in 2008-9
were cited in indexed journals during 2010
B = the number of articles, reviews, proceedings or
notes published in 2008-2009
Impact factor 2010 = A/B
following key points related to
Journal Impact factor
Journal Impact Factor can not be calculated for new
journals. I mean “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”, hence impact factor can
be calculated after completing the minimum of 3 years of
••••Journal Impact Factor will be a quotient factor only
and will not be a quality factor.
••••Journal Impact Factor will not be related to quality of
content and quality of peer review, it is only a measure
of the frequency with which the "average article" in a
has been cited in a particular year or period.
C1 denotes the number of citations received by S1
source items in the year Y
C2 denotes the number of citations received by S2
source items in the year Y
S1 denotes the number of source items published
in the journal J in the year Y-1.
S2 denotes the number of source items published
in the journal J in the year Y-2
the journal j has published 32
and 36 sources in 2007 and
respectively. These source items have
received respectively 40 and 28 citations
in 2009.Now the impact factor of the
journal j will be
„Abstracts are not defined as source
and so even if they only attract a few
there is a benefit to the Impact Factor‟
The impact factor is only one of three
measures created by the Institute of
(ISI) which can be used to measure the
way a journal
receives citations to its articles over
The best way to keep track of
who is citing you.
•Have a very complete copy of your
•Use Web of Science and Google
Scholar. They will produce overlapping
and unique results
•The Impact Factor is a an attempt to ensure the
impact a journal has.
•It is designed to “scale” the number of times a
journal has been cited.
•The older an article is, the more opportunities it
has to have been cited.
•Some disciplines have more people working in
them (child psychology vs. demography; surgery
Science and Social Science
editions must be searched
Before starting, click on
Information for New
Users and read “Using
the JCR Wisely.”
You can search by Full
Journal Title, Journal
Abbreviation, Title Word,
or ISSN. Select Title
Word from the menu.
Review articles are often more highly cited
than original research articles: consider a
journal’s source data by document type.
Tallies the number of original research and review articles published in the current year (2005)
Also tallies the number of references published by the selected journal in the current year
Other Items = document types not included in the number of citable items published by this journal (e.g.
letters, news items, editorials, etc.)
References to all
Publication year of
A list of journals
which have cited
AtmosphereOcean within 2004
Citing Journal List
The publication year of
the articles being cited
A list of journals that
cited within 2004.