Source-linked AI summary
Global Maps of Science based on the new Web-of-Science Categories
Loet Leydesdorff, Stephen Carley, Ismael Rafols
TL;DR
The transition from old ISI Subject Categories to new WoS Categories created classification differences requiring a recalibrated global map. The paper reorganizes the citation matrix into disciplinary factors and provides Pajek- and VOSviewer-compatible mapping tools, including an interdisciplinarity measure.
Problem
Differences between new WoS Categories and old ISI Subject Categories create semantic and classification issues for global disciplinary mapping.
Method
The authors recalibrate the global map using the 2010 Journal Citation Reports and organize the new citation matrix into factors for Pajek and VOSviewer visualization.
Results
19 factors explaining 54.3% of the variance most aptly show the disciplinary structure of the new citation matrix, with Computer Science divided into Computer Science and Mathematical Methods.
Takeaways & Limitations
The installation enables mapping inter- and multidisciplinary document sets and measuring Rao-Stirling diversity as an interdisciplinarity index.
Takeaways & Limitations
The analysis uses a matrix of 224 WoS Categories because Biology, Miscellaneous is not processed in the Journal Citation Reports from the citing side.
Abstract
from arXiv · showhide
In August 2011, Thomson Reuters launched version 5 of the Science and Social Science Citation Index in the Web of Science (WoS). Among other things, the 222 ISI Subject Categories (SCs) for these two databases in version 4 of WoS were renamed and extended to 225 WoS Categories (WCs). A new set of 151 Subject Categories (SCs) was added, but at a higher level of aggregation. Since we previously used the ISI SCs as the baseline for a global map in Pajek (Rafols et al., 2010) and brought this facility online (at http://www.leydesdorff.net/overlaytoolkit), we recalibrated this map for the new WC categories using the Journal Citation Reports 2010. In the new installation, the base maps can also be made using VOSviewer (Van Eck & Waltman, 2010).