Updated Impact Factor list according to 2014 Journal Citation Reports released by Thomson Reuters in 2015
Journal Impact Factor
The journal Impact Factor is the average number of times articles from the journal published in the past two years have been cited in the JCR year.
The Impact Factor is calculated by dividing the number of citations in the JCR year by the total number of articles published in the two previous years. An Impact Factor of 1.0 means that, on average, the articles published one or two year ago have been cited one time. An Impact Factor of 2.5 means that, on average, the articles published one or two year ago have been cited two and a half times. The citing works may be articles published in the same journal. However, most citing works are from different journals, proceedings, or books indexed by Web of Science.
5-Year Journal Impact Factor
The 5-year journal Impact Factor is the average number of times articles from the journal published in the past five years have been cited in the JCR year. It is caclulated by dividing the number of citations in the JCR year by the total number of articles published in the five previous years.
How to Calculate a Five-Year Impact Factor
Although Impact Factors are based on cites to articles published in the previous two years, average citation rates can be calculated using older or longer time periods.
A base of five 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 two years to disseminate and respond to published works. The 5-year Impact Factor is already calculated for JCR years 2007 and later. You may calculate the 5-year Impact Factor using an earlier JCR year as a starting point by following these steps:
1. Find the journal for which you want to calculate a five-year Impact Factor. Go to the Journal page.
2. Click the Impact Factor Trend button.
3. Scroll down the page to find the number of articles published in the past five years. Add up the numbers to find the total. For example, if you start out in JCR Science Edition 2003, you need to find the total number of articles published in 2002, 2001, 2000, 1999, and 1998.
4. Click the Return to Journal. On the Journal page, click the Cited Journal Data button to go to the Cited Journal Table.
5. Look in the All Journals row at the top of the table. Skip the first two columns (All Yrs and JCR year). Add up the numbers in the next five columns. For example, if the JCR year is 2003, you want find the total of the numbers found in columns 2002, 2001, 2000, 1999, and 1998.
6. Divide the total number of citations found in step 5 by the total number of articles found in step 3. This is the five-year Impact Factor.
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Updated Impact Factor list according to 2014 Journal Citation Reports released by Thomson Reuters in 2015 di SINI
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