As you would agree with me that review articles are read more and cited more. Periodontology 2000 will always have higher IF than any clinical journal as Periodontology 2000 only published review articles. IFs are strongly biased towards journals which publish review articles. No way is New England Journal Of Medicine inferior to CA-A Cancer Journal For Clinicians jusy because its impact fator is less. You can't compare IFs of cancer journal to medicine journal (with in related subjects also). The impact factor for New England Journal Of Medicine in 2016 was 72.406 and for CA-A Cancer Journal For Clinicians was 187.040. Within related subjects, for example, medicine, oncology, orthopedics, dentistry also may have variations in their impact factors. The lower impact factor of journals of History, Economics, Mathematics or Sociology does not make them inferior. History, Economics, Mathematics or Sociology journals may not have same levels of citations as medicine, chemistry or cell biology. Different subjects may have diverse levels and patterns of citation activity. Let me briefly touch on factors that have a huge impact on impact factors. Criticisms against ignorant use of IF have been well recognized. Use of IF without knowing the intricacies associated with it and factors that play a major role in manipulating it, may lead to conclusions that may not reveal the accurate picture. The IF is a bibliometric indicator, which should be used carefully, as a lot of variables play an important role in deciding the final impact factor. I must stress here that it is a bibliometric indicator for the journals only. Impact factor is an important parameter used in the dental, medical, and scientific fields to compare journals. The 2017 JCR impact factors (to be released in 2018) would be calculated as: The citation window here is the impact factor year, and the publication window refers to the two previous years. JCR gives a two-year impact factor and uses very specific time periods of publications and citations. Calculation of an impact factor (IF) requires the total number of citations to the articles (the numerator) and the total number of articles published (the denominator) within specific time periods. The 'impact factor' (IF) refers to statistics calculated and published by Thomson Reuters as Journal Citation Reports (JCR). Another publication by Garfield in 1972 in Science on “Citation Analysis as a tool in journal evaluation,” has been one of the most followed papers on this subject. Sher and Garfield created the journal impact factor to select journals for the new Science Citation Index (SCI). In 1961 Science Citation Index was published. Eugene Garfield first wrote about impact factor in Science magazine in 1955.
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