منابع مشابه
The journal impact factor denominator: defining citable (counted) items.
OVER ITS 30-YEAR HISTORY, THE JOURNAL IMPACT factor has been the subject of much discussion and debate. From its first release in 1975, bibliometricians and library scientists discussed its value and its vagaries. In the last decade, discussion has shifted to the way in which impact factor data are used. In an environment eager for objective measures of productivity, relevance, and research val...
متن کاملJournal Impact Factor: Do the Numerator and Denominator Need Correction?
To correct the incongruence of document types between the numerator and denominator in the traditional impact factor (IF), we make a corresponding adjustment to its formula and present five corrective IFs: IFTotal/Total, IFTotal/AREL, IFAR/AR, IFAREL/AR, and IFAREL/AREL. Based on a survey of researchers in the fields of ophthalmology and mathematics, we obtained the real impact ranking of sampl...
متن کاملOver the Journal Impact Factor
Thomson Reuters reports journal impact factor (JIF) 2012 thr ough its web database, Journal Citation Reports (JCR) (http:// apps.webofknowledge.com) for journals indexed in the Science Citation Index (SCI/SCIE). Many top journals are reported to continue their high JIF and most of others keep similar or in creased ones as JIF 2011. The JCR updates JIF every year and the JIF 2012 will be used ...
متن کاملThe journal impact factor today.
Wehavebeen recently notified that Jornal de Pediatriawill also soon be covered by Thomson Scientific (ISI). This is a major step towards our goal – from themoment our journal’s impact factor begins to be measured, we will be evaluated in terms of the journal’s weight within the context of the international pediatrics scene. This achievement was accomplished through hard work on the part of the ...
متن کاملThe journal Impact Factor and alternative metrics
J ournal impact factors (JIFs) have become a widely used tool to judge the quality of scientific journals and single publications. JIFs are calculated by the scientific division of Thomson Reuters and published annually in the Journal Citation Reports (JCR). At first, the JCR’s origin was guided by the needs of librarians who wanted to use a quantitative method to select journals for their hold...
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ژورنال
عنوان ژورنال: JAMA
سال: 2009
ISSN: 0098-7484
DOI: 10.1001/jama.2009.1301