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index which is independent of his/her age (Kosmulski 2009 ; Abt 2011 ), and (2) the accuracy of this index is the same as that of the h index (Abt 2011 ). These authors proposed that one can compare the publication activity of authors of different
different variables, such as professional rank and age, on authorship practices has also been explored in the literature, noting that scientists tend to sign more as last author and less often as first author as they get older (Gingras et al. 2008 ) and as
. 1994 ). To complement the given meta-data fields, additional data are used in our similarity calculations. These are: 1. Difference in years between publications: The age difference between publications will have an effect on the degree of
analysis of the obsolescence (Line 1993 ) or “durability” of knowledge (Tahai and Rigsby 1998 ). The analysis of the ageing of scientific production has been frequently addressed in bibliometric literature (Aversa 1985 ; Glänzel and Schoepflin 1995
current year (contemporary h -index), reducing the effects of co-authorship (individual h -index), and adjusting the number of citations by the age of each publication (age-weighted citation rate). Some scholars posit that these metrics are complementary
Katy Börner: Atlas of science: visualizing what we know
The MIT Press, Cambridge, MA/London, UK, 2010, US$20
Encyclopedia: one adapted for the internet age with its emphasis on access and visualization. As most of us know, the long-term project covers also the Networkbench (NWB) and the many other tools and platforms generated at the Cyberinfrastructure for Network
-009-2290-1 . 6. Glänzel , W. , Schoepflin , U. 1994 A stochastic model for the ageing of scientific literature . Scientometrics 30 1 49 – 64 10.1007/BF02017212 . 7
1998 A new classification system to describe the ageing of scientific journals and their impact factors . Journal of Documentation 54 : 387 – 419 https://doi.org/10.1108/EUM0000000007175
. We have not discussed the issue of normalization for the age of a publication. The latter type of normalization can be used to correct for the fact that older publications have had more time to earn citations than younger publications. Normalization
– 38,533 pages which is 7%). Presented feature is the second discriminant of historical science. The evaluation of the presence of the humanities in ISI databases has been the bone of contention for ages (Nowak 2000 , pp. 146–149). As the
