Page 138 - JOURNAL OF LIBRARY SCIENCE IN CHINA 2018 Vol. 43

138 Journal of Library Science in China, Vol.9, 2017

November 2015) to finally obtain the citation and usage data of 166,767 articles as the research
data. See the number of pieces of literature of each discipline in Table 1. This study selected the
year 2013 for the convenience of comparing the usage data to the citation data. There is a two
to three-year time window of accumulation for the citation data to become stable. To ensure
consistency with the time window of the citation data, the usage count in the research process
was based uniformly on the data under the data-intensive U2 field of literature title information
provided by the WoS platform, i.e., the usage count of sample literature from 2013 to the collection
time (November 2015). See the specific research approach in Figure1.

Table 1. Disciplinary sources and number of pieces of literature collected
Category Discipline Literature Total Usage Total Citation

Physics 101,784 3,476,553 698,629
Science & Engineering
Computer Science 43,386 685,907 133,442
Economics 17,983 281,245 40,476
Social science
Library and Information Science 3,614 102,077 8,095

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3 Analysis and discussion

3.1 Basic statistical features of usage

This section uses the above data to perform an exploratory empirical study on the magnitude
of data usage for academic literature. Considering that the citation data constitute a criterion
generally accepted to some extent and have some relatively solid theoretical basis and application