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Another common term is "impact factor". The impact factor, often abbreviated IF, is a measure of the citations to science and social science journals. It is frequently used as a proxy for the importance of a journal to its field. The Impact factor was devised by Eugene Garfield, the founder of the Institute for Scientific Information (ISI), now part of Thomson, a large worldwide US-based publisher. Impact factors are calculated each year by Thomson Scientific for those journals which it indexes, and the factors and indices are published in Journal Citation Reports. The publication of each year covered occurs in the summer of the following year. The impact factor of a journal is calculated based on a two-year period. It can be viewed as the average number of citations in a year given to those papers in a journal that were published during the two preceding years....
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