Journal Portfolio Analysis for Countries, Cities, and Organizations: Maps and Comparisons

Using Web-of-Science data, portfolio analysis in terms of journal coverage can be projected on a base map for units of analysis such as countries, cities, universities, and firms. The units of analysis under study can be compared statistically across the 10,000+ journals. The interdisciplinarity of the portfolios is measured using Rao-Stirling diversity or Zhang et al.’s (in press) improved measure 2 D 3 . At the country level we find regional differentiation (e.g., LatinAmerican or Asian countries), but also a major divide between advanced and less-developed countries. Israel and Israeli cities outperform other nations and cities in terms of diversity. Universities appear to be specifically related to firms when a number of these units are exploratively compared. The instrument is relatively simple and straightforward, and one can generalize the application to any document set retrieved from the Web-of-Science (WoS). Further instruction is provided online at http://www.leydesdorff.net/portfolio.