Co-occurrence data of international co-authorships aggregated at the national level

These data show the aggregation at the nation-nation level of co-occurrences of authorship of scientific papers. The data are in excel as a matrix with resulting cells indicating the number of times these two country names appear in the same article. The original data are from ISI Web of Science. The year represented is 2011. The data complement an article being published in PLoS ONE, "The Continuing Growth of Global Cooperation Networks in Research: A conundrum for national governments"