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Citation analysis plays a pivotal role in faculty tenure, promotion and hiring decisions in academic institutions.

Part 2: Impact Factor (IF) and Metric Impact Tools

Impact Factor (IF)

The IF of an academic journal measures its importance by calculating the number of times its articles are cited. To understand how an IF is calculated, the calculation is based on a two-year or five-year period and involves dividing the number of times articles were cited by the number of articles that are citable. The concept IF was created by Eugene Garfield (founder of the Institute for Scientific Information). It is important to remember experts stress that there are limitations in using impact factors to evaluate a scholar's work. Examples of citation systems that use a calculation in order to evaluate the impact of a scholar or journal are: h- index;   g-index;    e-index;   hc-index;   hI-index;   hI,norm.  For a full discussion of each index click the link below.

Journal Citation Reports (JCR)

Journal Citation Reports (JCR) is a citation tool for evaluating a journal’s IF.  It is owned by ThomsonReuters (the same company that owns Web of Science) and comes in two editions: Science or Social Sciences. Impact factors are calculated yearly starting from 1975. JCR uses both the Eigenfactor® Score and the Article Influence® Score in order to assess the influence of a journal in relation to other journals. The last five years of citation activity are counted.   Eigenfactor metrics are available from JCR for years 2007 and later. For a more in depth explanation of Eigenfactor and Article Influence Scores click here: http://www.eigenfactor.org/whyeigenfactor.php

To perform a journal ranking search using Eigenfactor, click here: http://www.eigenfactor.org/projects/journalRank/journalsearch.php 

this includes Article Influence Score too.

JCR also offers a metric indicator called the Immediacy Index. The Immediacy Index is the average number of times an article is cited in the year it is published.  This index attempts to quantify the importance of recent articles in particular journals.  For a discussion on the usefulness of this index click here: http://www.enago.com/blog/immediacy-index/

SCImago Journal & Country Rank (SJR Indicator)

SCImago Journal & Country Rank (SJR Indicator) is a citation tool and portal that includes the journals developed from the information contained in the database Scopus for evaluating a journal’s impact factor. The last two years of citation activity are calculated and access to SJR indicator is free.  For a more in depth explanation of the metrics of this system click here: http://en.wikipedia.org/wiki/SCImago_Journal_Rank

To perform a journal ranking search using SJR, click here: http://www.scimagojr.com/journalsearch.php

Alternate Sources to Academic Impact Metrics

Altmetrics was created as an alternative source to academic citation impact metrics, such as IF, h-index, g-index, etc.  Since 2010, Altmetrics looks at what people are saying about papers online which includes article views, downloads, or mentions in social media and news media.  For more in-depth information on Altmetrics click here: http://www.ala.org/acrl/publications/keeping_up_with/altmetrics

Impactstory.org  is another alternative source of impact metrics and it tracks how your research is read, cited, tweeted and bookmarked.  For more in-depth information on Impactstory.org click here:

https://impactstory.org/about

Asst Univ. Librarian for Graduate Services

Michelle Lang's picture
Michelle Lang
Contact:
Michelle Lang
Asst Univ. Librarian for Graduate Services
Pace University
Mortola Library, 2nd Floor, Pleasantville, NY
Birnbaum Library, 1st Floor, New York, NY
(212) 346-1778 rings at both offices

Publish or Perish (PoP)

PoP uses Google Scholar queries to obtain citation information, which is then analyzed and converted to a number of statistics.  Advantages of using Google Scholar over ISI or Scopus   1. It is free 2. It is easy to use 3. It is quick 4. It is comprehensive in its coverage.  PoP was designed to calculate citation metrics and can assist with:

  1. Deciding which journal to submit your work to.
  2. Getting ideas of the types of journals that publish articles on the topic you are writing on.
  3. Compare a set of journals in terms of their citation impact.
  4. Perform a quick literature review to identify the most cited articles and/or scholars in a particular field.
  5. Identify whether any research has been done in a particular area (useful for grant applications).
  6. Doing bibliographic research on both authors and journals.
  7. Find out who is citing you and where.
 

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