Citation Index and Impact factor

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511Indian Journal of Dermatology, Venereology, and Leprology | July-August 2012 | Vol 78 | Issue 4
Citation Index and Impact factor
Anjana Nigam, Pramod K. Nigam
1
Resident's
page
Departments of Surgery, and
1
Dermatology and STD, Pt. J.N.M.
Medical College, Raipur, Chhattisgarh, India
Address for correspondence:
Dr. Anjana Nigam,
D-30-A, Shailendra Nagar, Raipur – 492 001, Chhattisgarh, India.
E-mail: dr.anjananigam@gmail.com
How to cite this article: Nigam A, Nigam PK. Citation Index and Impact factor. Indian J Dermatol Venereol Leprol 2012;78:511-6.
Received: November, 2011. Accepted: April, 2012. Source of Support: Nil. Conict of Interest: None declared.
“Citations are an acknowledgement of intellectual
debt.”
- Henry Small
INTRODUCTION
A citation is the text reference and acknowledgement
of a documented information. A scientifically written
article comprises a reference section at the end where
all the references mentioned in the document are cited
serially, and each reference is a citation. A citation
count is the frequency of an article cited by other
articles. A citation index is a kind of bibliographic
database, an index of citations between publications,
allowing the user to easily establish which later
documents cite which earlier documents.
[1]
Citation
indexing consists of the charting of the text details of
each such reference. Citations are used as a measure
of importance of the information source and enables
users to gather data on the “impact” of journals as well
as assessing and analyzing particular areas of research
activity and publication.
[2]
Developments
In 1960, Eugene Garfield’s Institute for Scientific
Information (ISI, formerly Eugene Garfield Associates
Inc.) introduced the first citation index for papers
published in academic journals, the Science Citation
Index (SCI).
[1]
Later, it was further expanded to
produce the Social Sciences Citation Index (SSCI)
and the Arts and Humanities Citation Index (AHCI).
In 1965, de Solla Price described the inherent linking
characteristic of the SCI as “Networks of Scientific
Papers”.
[3]
The SSCI became one of the first databases
to be mounted on the Dialog system in 1972.
[4]
In
1973, Small published his classic work on Co-Citation
analysis, which became a self-organizing classification
system and eventually an “Atlas of Science” later called
“Research Reviews.”
[5]
The graphical nature of the
worldwide citation network was described by Ralph
Garner in 1965.
[6]
Autonomous citation indexing,
introduced in 1998,
[7]
enabled automatic algorithmic
extraction and grouping of citations for any digital
academic and scientific document. This led to the
creation of new systems for public and automated
citation indexing such as, CiteSeer (now CiteSeer
X
),
Cora (Rexa) and Google Scholar.
Major Citation Indexing services
There are two major publishers of general-purpose
academic citation indexes:
a. Institute for Scientic Information (ISI): Citation
indexing has long been dominated by the
ISI, which is now part of Thomson Reuters.
[8]
It publishes the citation indexes in print
and compact disc forms, which are generally
accessed through the web under the name
‘Web of Science’ (WOS). WOS provides access
to 7 databases: Science Citation Index (SCI),
Social Sciences Citation Index (SSCI), Arts
& Humanities Citation Index (A&HCI), Index
Chemicus, Current Chemical Reactions,
Conference Proceedings Citation Index: Science
and Conference Proceedings Citation Index:
Social Science and Humanities.
b. Elsevier Which publishes Scopus, is available
online only. Scopus is one of the largest abstract
and citation database of peer-reviewed literature
and web sources with smart tools to track,
Access this article online
Quick Response Code:
Website:
www.ijdvl.com
DOI:
10.4103/0378-6323.98093
PMID:
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Nigam and Nigam Citation Index and Impact factor
Indian Journal of Dermatology, Venereology, and Leprology | July-August 2012 | Vol 78 | Issue 4512
analyze and visualize research.
There are also a number of other readily available
citation databases. Some of the notable ones among
these are:
• CiteSeer is both a citation engine and
a digital library. CiteSeer is based on
the SmealSearch engine
[9]
and provides citation,
citation graph analysis, related document retrieval
and other searching of scientific literature.
[10]
Research Papers in Economics (RePec) provides
databases in economics and other discipline-
specific indexes.
[11]
• Google Scholar (GS) provides citation and search
of scholarly literature across many disciplines and
sources. Although limited to the recent articles, it
is a freely-accessible web search engine. Google
Scholar is generally praised for its speed.
[12]
• EBSCOhost is one of the world’s foremost, most-
used, premium, reference database service.
• Compendex (Engineering Index, COMPuterized
ENgineering inDEX) is the computerized version
of the Engineering Index and is one of the most
comprehensive engineering literature databases.
Bibliometrics
Bibliometrics are methods or applications used to
study or measure an influence of a writer or impact of a
scientific paper. Citation analysis and content analysis
are most commonly used bibliometric methods. Other
bibliometrics applications include: Creating thesauri;
measuring frequencies; exploring author affiliations;
and measuring usage by readers.
Citation analysis
Citations can be counted as measures of usage and
impact of the cited work.
[13]
Data from citation indexes
can be analyzed to determine the popularity and impact
of specific articles, authors and research publications.
This is called citation analysis. Some of the measures
that have emerged from citation analysis are:
a. Citation Count
A Citation Count is the number of times an article
is cited by other articles.
[14]
Sometimes, it is
considered to indicate the quality and influence of
the article.
[14]
The citation count may be analyzed
for:
• The frequency of citation of an individual
article
• Total citations / average citation count of an
author per article
• The average citation count for the articles in
the journal
• Journal impact factor
Citation counts are correlated with other measures
of scholarly / scientific performance and impact
and can in some cases be enhanced by making a
work open access by self-archiving the complete
article on the web, publishing it in an open access
journal, or publishing it as an open access article in
one of the Hybrid open access journals.
[15]
b. H-index
The H-index, sometimes called the Hirsch
index or Hirsch number, was first developed by
Hirsh
[16]
as a measure to quantify the impact and
quality of the published work of a scientist or
scholar. A scientist has index h if h of his Np papers
have at least h citations each, and the other
(Np−h)papershavenomorethan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.
[16]
For example, if
the h-index is 15, you have 15 papers cited 15 times
or more. If your h-index is 20, you have 20 papers
cited 20 times or more.
Citation reports in Web of Science and
citation tracker in Scopus calculate the
h-index of a search result. Harzing’s Publish or
Perish program
[17]
calculates the h-index based
on Google Scholar entries. Various proposals to
modify the h-index in order to emphasize different
features have been made.
[18]
Bornmann et al.,
[19]
recently proposed 3 additional metrics, h2lower,
h2center, and h2upper to give a more accurate
representation of the distribution shape. Scientists
with high h2upper percentages are perfectionists,
whereas scientists with high h2lower percentages
are mass producers.
c. i10-index
i10-index is the number of publications with at least
10 citations. In July 2011, Google Scholar started a
tool, which allows scholars to keep track of their
own citations and also produces an h-index and
an i10-index.
d. Download counts
While the number of times a scientific article is cited
by other articles is currently the gold standard for
ranking its impact, online publishing offers another
measure: The number of unique downloads.
[20]
A recent analysis finds that downloads are a
good predictor of citations, and they are available
significantly faster.
[20]
Journal of Vision (JOV) recently began publishing
download counts for every published article. The
journal also ranks the top 20 articles by download.
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Nigam and Nigam Citation Index and Impact factor
513Indian Journal of Dermatology, Venereology, and Leprology | July-August 2012 | Vol 78 | Issue 4
Download counts mirror citations, but are available
about 2 years earlier and thus download counts
predict future impact of scientific papers.
[21]
e. KeyWords Plus
®
In 1990, ISI was able to introduce this citation-
based method of derivative subject indexing,
called KeyWords Plus
®
.
[22]
In addition to title
words, author-supplied keywords and abstract
words supplies words and phrases to enhance
retrievability.
Journal Impact Factor
An important and predictive measure of research
impact in research is the Journal Impact Factor (JIF) of
the journal in which the article appears.
[23]
The JIF is
the average number of citations per article per year.
[23]
It is an indication of the importance and uptake of
that research, denoting the relative importance of
a journal within its field, like journals with higher
impact factors are deemed to be more important than
those with lower ones. Impact factors are generally
calculated yearly.
[23]
In a given year or period, the impact factor of a journal
is the average number of citations received per paper
published in that journal during the 2 preceding
years.
[24]
For example, an impact factor 2011 for a journal
is calculated as follows:
• N
1
= Number of times articles published in 2009-
2010 were cited in indexed journals during 2011
• N
2
= Number of articles, reviews, proceedings
or notes (not editorials or Letters-to-the-Editor)
published in 2009-2010
• Impact factor 2011 (IF-2011) = N
1
/ N
2
(Note: As the IF is calculated for the 2 preceding years,
the IF 2010 will be actually published in 2011 because it
could not be calculated until all of the 2010 publications
have been processed by the indexing agency. Similarly,
IF 2011 will be published in 2012). The Journal Impact
Factor 2011 for few journals is shown in Table 1.
Related Indices: Some related values, connected with
Journal Impact Factor are:
1. Immediacy index
Immediacy index measures the average number of
times that an article, published in a specific year
within a specific journal, is cited over the course of
the same year.
[25]
2. Cited half-life
Cited half-life measures the number of years, going
back from the current year that account for half
the total citations received by the cited journal in
the current year.
[25]
For example, if a journal’s cited
half-life in 2005 is 5, that means the citations from
2001-2005 are half of all the citations from that
journal and the other half of the citations precede
2001.
3. Aggregate impact factor for a subject category
It is calculated taking into account the number of
citations to all journals in the subject category and
the number of articles from all the journals in the
category.
[25]
Table 1: Journal Impact Factor 2011
Rank Medicine Journals Overall Surgery Journals Overall Dermatology Journals
Journal Impact
Factor
Journal Impact
Factor
Journal Impact
Factor
1 NewEnglJMed 53.484 AnnSurg 7.474 JInvestDermatol 6.27
2 Lancet 33.633 Endoscopy 6.096 Pigm Cell Melanomar Res 4.75
3 JAmMedAssoc 30.011 AmJTransplant 6.048 BrJDermatol 4.351
4 AnnInternMed 16.729 JNeurolNeurosurPs 4.791 JAmAcadDermatol 4.274
5 PLOS Med 15.617 ArchSurg-Chicago 4.5 ArchDermatol 4.231
6 BrMedJ 13.471 BrJSurg 4.444 ExpDermatol 4.159
7 AnnuRevMed 12.457 JAmCollSurgeons 4.241 JDermatolSci 3.712
8 ArchInternMed 10.639 AnnSurgOncol 4.182 ContactDermatitis 3.672
9 CanMedAssocJ 9.015 AmJSurgPathol 4.106 WoundRepairRegen 3.443
10 CochraneDbSystRev 6.186 JVascSurg 3.851 JEurAcadDermatol 3.309
11 JInternMed 5.935 Transplantation 3.676 ActaDerm-Venereol 3.78
12 BMC Med 5.75 JThoracCardiovSur 3.608 Dermatology 3.714
13 MayoClinProc 5.712 AnnThoracSurg 3.558 SkinPharmacolPhys 3.711
14 AmJMed 5.115 WoundRepairRegen 3.443 ClinDermatol 3.424
15 AnnFamMed 4.457 SurgEndosc 3.436 EurJDermatol 3.421
Source:http://impactfactor.weebly.com/
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Nigam and Nigam Citation Index and Impact factor
Indian Journal of Dermatology, Venereology, and Leprology | July-August 2012 | Vol 78 | Issue 4514
4. Median impact factor
It is the median value of all journal impact factors
in the subject category.
[26]
5. Year Impact Factor
It is similar in nature to the Journal Impact Factor;
however, the citations are counted to the previous
5 years and again divided by the source items
published in the previous 5 years. A base of 5 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 2 years to disseminate
and respond to published works.
[27]
For example, 5
yr Impact Factor: 32457 citations in 2011 to items
published in 2010, 2009, 2008, 2007, and 2006 /
11648 items published in 2006-2010 = 2.392.
C3PO (Citation Performance Per Paper Online)
ISI reports the mean number of citations for an ISI
journal, namely total citations up to a given day
divided by the number of papers published in an ISI
journal up to the same day as the “average” number of
citations. The C3PO of an ISI journal on any given day
is defined as ‘C3PO (Citation Performance Per Paper
Online) = Total citations to a journal / Total papers
published in a journal.’
[28]
Z-inuence
It measures the number of papers in a journal that have
never been cited. The lack of citations of a published
paper, especially over an extended period, must surely
detract from the quality of a journal by exposing:
(i) what might be considered as incorrect decisions
by the editorial board of a journal; and (ii) the lost
opportunities of papers that might have been cited
had they not been rejected in favor of papers that
are ignored by the profession. Z influence = zero
influence, based on zero citations in ISI journals.
Z influence can be measured by the PI-BETA (Papers
Ignored (PI) - By Even The Authors (BETA) ratio, and
is calculated for an ISI journal on any given day as:
PI-BETA = Number of Z - influence papers in an ISI
journal / Total papers published in an ISI journal. Thus,
PI-BETA for 20 January 2012 is based on Z influence
and total papers up to and including 20 January 2012.
[29]
The daily updates change the h-index, C3PO and PI-
BETA scores.
Impact Factor Ination (IFI)
The ratio of 2-year impact factor (2YIF) to 2-year
impact factor without self citations (2YIF*) is intended
to capture how journal self citations inflate an impact
factor of a journal. An Impact Factor Inflation (IFI)
is defined as “IFI = 2YIF / 2YIF*”. The minimum
value for IFI is 1, with any value above the minimum
capturing the effect of journal self citations on the
2-year impact factor.
[29]
Self-citation Threshold Approval Rating (STAR)
ISI has implicitly recognized the inflation in journal
self citations by calculating an impact factor that
excludes self citations, and provides data on journal
self citations, both historically and for the preceding 2
years, in calculating 2YIF. The Self-citation Threshold
Approval Rating (STAR) is the difference between
citations in other journals and journal self citations.
If S = journal self citations, STAR is defined as “STAR=
(100 - S) - S] = (100 - 2S)”. If S = 0, 25, 50 or 100, for
example, STAR = 100, 50, 0 and -100, respectively. As
STAR can be calculated using journal self citations, both
historically and for the preceding 2 years, historical
STAR is H-STAR and a 2-year STAR is 2Y-STAR.
[30]
Cited Article Inuence (CAI)
Article Influence is intended to measure the average
influence of an article across the sciences and social
sciences. As an article with zero citations cannot have
influence, a more suitable measure of the influence of
cited articles is Cited Article Influence (CAI), which
is defined as “CAI = (1 - PI-BETA)(Article Influence)”.
If PI-BETA = 0, then CAI is equivalent to Article
Influence; if PI-BETA = 1, then CAI = 0. As Article
Influence is calculated annually, whereas PI-BETA is
updated daily, CAI may be updated daily.
[30]
Recursive impact factor
In 1976, a recursive impact factor that gives citations
from journals with high impact greater weight than
citations from low-impact journals was proposed.
[31]
It
resembles the PageRank algorithm of the Google search
engine.
Eigen factor
The Eigen factor is another PageRank-type measure of
journal influence with rankings freely available online.
The Eigen factor™ score of a journal is an estimate of
the percentage of time that library users spend with
that journal.
[32]
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Nigam and Nigam Citation Index and Impact factor
515Indian Journal of Dermatology, Venereology, and Leprology | July-August 2012 | Vol 78 | Issue 4
SCImago Journal Rank (SJR) indicator
The SJR is an open access, free journal citation-
metric, based on citation information from Scopus.
SJR indicator is a measure of scientific influence of
scholarly journals that accounts for both the number
of citations received by a journal and the importance
or prestige of the journals where such citations come
from.
[33]
The SJR indicator provides an alternative to
the Impact Factor (IF)
Journal Citation Reports
Journal Citation Reports (JCR), integrated with the
Web of Knowledge, is an annual publication by the
healthcare & science division of Thomson Reuters.
[34]
It provides information about academic journals in
the sciences and social sciences subject categories,
including impact factors, the journal immediacy index
and the journal citing half life. The JCR citation data
on journals provides quantitative tools for ranking,
evaluating, categorizing and comparing journals.
[8]
Indian Citation Index
Indian Citation Index (ICI) database was developed
with specific motives to promote knowledge contents,
published in Indian journals and bridge the gap
between the content sources and content users via
World Wide Web.
[35]
ICI database covers about 1000
Indian scholarly journals, encompassing all disciplines
of knowledge including the sciences, social sciences,
arts, and humanities. ICI like other indexes enables
user to move back in time to previously published
papers, but uniquely one can also look forward in time
to determine who has subsequently cited an earlier
piece of research. This feature makes this database a
specialized information product and highly useful for
researchers, policy makers, decision takers, editors,
librarians etc.
[35]
The ICI database also produces other
useful by-products like Indian Science Citation Index
(ISCI), Indian Social Science and Humanities Citation
Index (ISSHCI), Indian Journals Citation Reports
(IJCR), Indian Science and Technology Abstracts
(ISTA) and Directory of Indian Journals (DOIJ).
[35]
Citation indexing: Uses and Limitations
Citation indexes provide authoritative, timely and
prospective as well as retrospective in-depth access to
the literature.
[8]
Citation indexes also provide various
indicators to evaluate the author impact in a subject.
Through citation analysis, citation index provides
journal ranking by giving information about what
articles, themes, and topics were being published,
cited, or ignored and also offers unique insight into
a particular journal and provides data on historical
trends, immediacy index, cited half-life of journals
etc.
[36]
Citation analysis helps to know the Journal
Impact Factor (JIF), Author Self- Citation (ASC) and
Journal Self-Citation (JSC). Citation index also helps
to determine the latest areas of research through
bibliometric indicators.
With citations used as the criterion for importance,
utmost care should be taken as the authors may cite
their own work, thus increasing its apparent academic
importance. Secondly, significant articles may appear
in obscure places (non-core journals) and be missed
by the indexers.
[37]
CONCLUSION
Multiple sources are available on the web like Web
of Science, Scopus, Google Scholar, and others to
evaluate research impact and quality of a research
work accurately as well as to find out citation
counts, h-index and so on. The h-index has been
proposed as the best measure of a scientist’s research
productivity.
[38]
Citation analysis has shown that some
90% of papers that have been published in academic
journals are never cited, and as many as 50% of papers
are never read by anyone other than their authors,
referees and journal editors.
[39]
The citation databases,
tools and citation methods mentioned here are just a
few of many new and powerful indicators of research
output. Citation index needs to be upgraded from
time-to time by creating and designing it for specific
subject using latest technology and manual efforts.
[40]
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