Information Technology Reference
In-Depth Information
7.3
Swanson's Impact
The following example is based on citation records retrieved from the Web of
Science as of 17th April 2001. First, a search was conducted across all databases
between 1981 and 2001, the entire coverage available to the version we access.
This search aimed to locate Swanson's articles as many as possible within these
citation databases. The AUTHOR field for the search was “Swanson DR” and
the ADDRESS as “Chicago”. This search returned 30 records. These 30 articles
served as a seeding set. In the second step, we expanded this initial set of articles
by including articles that have cited at least one article in the seeding set. All the
citations from the expanded set of articles form the population for the subsequent
document co-citation analysis. We applied a threshold of 65 to select top-slice
articles from this all-citation set. A total of 246 articles that met this criterion were
selected and analyzed to form a series of document co-citation maps as the snapshots
of the impact of Swanson's work.
Figure 7.7 shows an overview of the document co-citation map. The entire
network is divided into three focused areas, which are colored by factor loadings.
Fig. 7.7 An overview of the document co-citation map. Lit-up articles in the scene are Swanson's
publications. Four of Swanson's articles are embedded in the largest branch - information science,
including information retrieval and citation indexing. A dozen of his articles are gathered in the
green specialty - the second largest grouping, ranging from scientometrics, neurology, to artificial
intelligence. The third largest branch - headache and magnesium - only contains one of Swanson's
articles
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