i find impact factor of a journal in journal citation reports.
i find impact factor of a journal in journal citation reports.
where do i find impact factor of a journal?
journal citation reports
new journals, which are indexed from their first published issue, will receive an impact factor after two years of indexing; in this case, the citations to the year prior to volume 1, and the number of articles published in the year prior to volume 1, are known zero values. journals that are indexed starting with a volume other than the first volume will not get an impact factor until they have been indexed for three years. occasionally, journal citation reports assigns an impact factor to new journals with less than two years of indexing, based on partial citation data. the calculation always uses two complete and known years of item counts, but for new titles one of the known counts is zero. annuals and other irregular publications sometimes publish no items in a particular year, affecting the count. the impact factor relates to a specific time period; it is possible to calculate it for any desired period. for example, the jcr also includes a five-year impact factor, which is calculated by dividing the number of citations to the journal in a given year by the number of articles published in that journal in the previous five years.
impact factor
journal impact factors are often used to evaluate the merit of individual articles and individual researchers. this particular use of impact factors was summarised by hoeffel:impact factor is not a perfect tool to measure the quality of articles but there is nothing better and it has the advantage of already being in existence and is, therefore, a good technique for scientific evaluation. experience has shown that in each specialty the best journals are those in which it is most difficult to have an article accepted, and these are the journals that have a high impact factor. most of these journals existed long before the impact factor was devised. the use of impact factor as a measure of quality is widespread because it fits well with the opinion we have in each field of the best journals in our specialty...in conclusion, prestigious journals publish papers of high level. therefore, their impact factor is high, and not the contrary.as impact factors is a journal-level metric, rather than an article or individual level metric, this use is controversial. garfield agrees with hoeffel, but warns about the "misuse in evaluating individuals" because there is "a wide variation [of citations] from article to article within a single journal".
impact factor