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# Impact factor of journals

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### Impact factor of journals

1. 1. Basic Definitions
2. 2. Timing
3. 3. Calculation     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
4. 4. Calculating the BMJ‟s impact factor for 2003
5. 5. 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 publication.  ••••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 journal  has been cited in a particular year or period. 
6. 6.  C1+C2 S1+S2 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
7. 7. Example  Suppose the journal j has published 32 and 36 sources in 2007 and 2008 respectively. These source items have received respectively 40 and 28 citations in 2009.Now the impact factor of the journal j will be 40+28/32+36=1
8. 8. Features
9. 9. Uses
10. 10. „Abstracts are not defined as source items  and so even if they only attract a few citations,  there is a benefit to the Impact Factor‟ 
11. 11. The impact factor is only one of three standardized  measures created by the Institute of Scientific Information  (ISI) which can be used to measure the way a journal  receives citations to its articles over time. 
12. 12. The best way to keep track of who is citing you.  •Have a very complete copy of your publications  •Use Web of Science and Google Scholar. They will produce overlapping and unique results
13. 13.  •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 vs. mycology)
14. 14. Science and Social Science editions must be searched separately Before starting, click on Information for New Users and read “Using the JCR Wisely.”
15. 15. You can search by Full Journal Title, Journal Abbreviation, Title Word, or ISSN. Select Title Word from the menu.
16. 16. Click on title link to display full record.
17. 17. 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.)
18. 18. References to all older articles. Publication year of cited article. A list of journals which have cited AtmosphereOcean within 2004
19. 19. Citing Journal List The publication year of the articles being cited A list of journals that Atmosphere-Ocean has cited within 2004.
20. 20. Impact Factor Trend Graph
21. 21. Examine Subject Categories