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Abstract
According to the definition of reliability-based citation impact factor (R-impact factor) proposed by KUO & RUPE and the cumulative citation age distribution model, a mathematical expression of the relationship between R-impact factor and impact factor is established in this paper. By simulation of the change processes of the R-impact factor and impact factor in the manipulation process of the impact factor, it is found that the effect of manipulation can be partly corrected by the R-impact factor in some cases. Based on the Journal Citation Report database, impact factors of 4 normal journals and 4 manipulated journals were collected. The journals’ R-impact factors and self-cited rates in the previous two years were calculated for each year during the period 2000 to 2007, and various characteristics influenced by the manipulation were analyzed. We find that the R-impact factor has greater fairness than the impact factor for journals with relatively short cited half-lives. Finally, some issues about using the R-impact factor as a measure for evaluating scientific journals are discussed.
Introduction J.K. Vanclay's 1 recent article Vanclay ( 2011 ) on the journal impact factor (JIF) is a new occasion to debate about the commander's statue in bibliometrics. The statue is still standing in spite of injuries from
Introduction One of the most commonly used and prominent citation-based indicators of the performance and significance of a scientific journal is the journal impact factor (JIF), which was introduced in 1955 by Garfield ( 1999
is 50 according to the Thomson Reuters Web of Science data base, and 58 according to the Google Scholar Universal Gadget. Journal impact factor (IF) Fifty years ago Eugene Garfield proposed the IF (Garfield 1972a , b
Introduction The journal impact factor (JIF) continues to be one of the most widely used scientometric indicators. It is computed for each year (Y) according to the following equation (Glänzel and Moed 2002 ): where Y1 and Y
Abstract
The ISI journal impact factor (JIF) is based on a sample that may represent half the whole-of-life citations to some journals, but a small fraction (<10%) of the citations accruing to other journals. This disproportionate sampling means that the JIF provides a misleading indication of the true impact of journals, biased in favour of journals that have a rapid rather than a prolonged impact. Many journals exhibit a consistent pattern of citation accrual from year to year, so it may be possible to adjust the JIF to provide a more reliable indication of a journal’s impact.
Introduction As many have noted, the journal impact factor (JIF) may be the most widely used scientometric indicator. This indicator is computed for each year (Y) according to the following equation (Glänzel and Moed 2002
There is some controversy around the impact factor (IF) rank-order distribution. The controversy is around the shape of the IF-rank-order distribution. In some articles (Lancho-Barrantes et al. 2010 ; Guerrero-Bote et al. 2007 ) one claims
Abstract
An examination of the relationships between journal impact factors and individual subscription prices of interdisciplinary social science journals revealed a very small and statistically nonsignificant negative association.
Abstract
The 598 papers on physics published between 1987 and 1994 with at least one author presinting Chilean affiliation are scrutinized. Several aspects are cross-examined along the period of eight years: number of papers, cumulative impact factor, average impact factor, international co-authorship, most visited journals and main Chilean institutions. It is found that physics is growing in Chile with international collaboration playing an important role. The average impact factor is relatively high and rather constant throughout the period reflecting that the good level of Chilean physics is stable. The articles spread in 165 different journals, but most of the productivity is to be found in a few journals of high impact factor. Most of the research is done by institutions in Santiago but other emerging institutions are also identified.
