This database is available to the CWTS’ under license from its publisher Thomson Scientific; it contains publication data from the year 1980 onward.
We count whole years, so 1995–1996 counts as a 2-year citation window, even though the difference is only 1 year.
This number is defined as the absolute difference between the number of papers in the first and last year, divided by the total number of papers; it has an approximately normal distribution if the required number of publications is large enough.
We used a median instead of a mean value, because the median is less affected by the outliers present in many of our time-series of growth rates due to the limited number of values in the series.
For example, due to the inclusion of a new journal with a higher number of references per paper that other journals in the field.
Note that if the Research Focus column contains N (no focus is found in the citing publications), then the value in the Reciprocal column can only be N as well.
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Morris, SA 2005 Manifestation of emerging specialties in journal literature: A growth model of papers, references, exemplars, bibliographic coupling, cocitation and clustering coefficient distribution. Journal of the American Society for Information Science and Technology 56 12 1250– 1273 10.1002/asi.20208.
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