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How do I find the Impact Factor of a journal? Is there a way to find this information online?

Impact factors are published in a resource called Journal Citation Reports (JCR). The JCR is a unique tool for journal evaluation using citation data drawn from over 8,400 journals in science, technology, and social sciences from more than 3,000 publishers worldwide. Access the JCR online for data from the last two years using the Electronic Resources page or directly. For data from previous years, use the printed JCR at the Information Desk. The JCR can show you the highest impact journals; most frequently used journals; hottest journals; largest journals. The journal impact factor is a measure of the frequency with which the "average article" in a journal has been cited in a particular year. The impact factor helps evaluate a journal's relative importance, especially compared to others in the same field. The impact factor is calculated by dividing the number of current citations to articles published in the two previous years by the total number of articles published in the two previous years.