Dear colleagues,
For the measurement of interdisciplinarity, one can use, for example, Rao-Stirling diversity which is defined as follows (Rao, 1982; Stirling, 2007): Δ = Σij pi pj dij (1) where dij is a disparity measure between two classes i and j-the categories are in the case below journals-and pi is the proportion of elements assigned to each class i. As the disparity measure, we use the distances on an aggregated journal-journal citation map (Leydesdorff, Heimeriks, & Rotolo, in press; Leydesdorff, Rafols, & Chen, 2013). For example, 23 publications can be retrieved as of today with the search string "au=Marijuan P*" at WoS. The journal map is as follows: cid:image001.gif@01D09216.E78CE210 and the Rao-Stirling diversity ("interdisciplinarity") of this set is 01282. If I repeat the analysis with the search string "au=leydesdorff l*", I retrieve 270 documents; Rao-Stirling diversity is 0.0805. cid:image002.gif@01D09216.E78CE210 In other words, Leydesdorff is more prolific than Marijuan in terms of WoS publications, but Marijuan's portfolio is more interdisciplinary than Leydesdorff's. One finds the relevant software at http://www.leydesdorff.net/portfolio/index.htm Reference: Leydesdorff, L., Heimeriks, G., & Rotolo, D. (2015 (in press)). Journal Portfolio Analysis for Countries, Cities, and Organizations: Maps and Comparisons <http://arxiv.org/abs/1502.05676> . Journal of the Association for Information Science and Technology.
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