Physics – Physics and Society
Scientific paper
2009-11-05
Loet Leydesdorff & Ismael Rafols, A Global Map of Science Based on the ISI Subject Categories, Journal of the American Society
Physics
Physics and Society
Scientific paper
The ISI subject categories classify journals included in the Science Citation Index (SCI). The aggregated journal-journal citation matrix contained in the Journal Citation Reports can be aggregated on the basis of these categories. This leads to an asymmetrical transaction matrix (citing versus cited) which is much more densely populated than the underlying matrix at the journal level. Exploratory factor analysis leads us to opt for a fourteen-factor solution. This solution can easily be interpreted as the disciplinary structure of science. The nested maps of science (corresponding to 14 factors, 172 categories, and 6,164 journals) are brought online at http://www.leydesdorff.net/map06/index.htm. An analysis of interdisciplinary relations is pursued at three levels of aggregation using the newly added ISI subject category of "Nanoscience & nanotechnology". The journal level provides the finer grained perspective. Errors in the attribution of journals to the ISI subject categories are averaged out so that the factor analysis can reveal the main structures. The mapping of science can, therefore, be comprehensive at the level of ISI subject categories.
Leydesdorff Loet
Rafols Ismael
No associations
LandOfFree
A Global Map of Science Based on the ISI Subject Categories does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Global Map of Science Based on the ISI Subject Categories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Global Map of Science Based on the ISI Subject Categories will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-418300