"To glean a country's, territory's, region's or an institution's contribution to an article, and to ensure that they are not counted more than once, the Nature Index uses Share, a fractional count that takes into account the share of authorship on each article. The total Share available per article is 1, which is shared among all authors under the assumption that each contributed equally."
"The Nature Index uses Count and Share to track research output. A country/territory or an institution is given a Count of 1 for each article that has at least one author from that country/territory or institution. This is the case regardless of the number of authors an article has, and it means that the same article can contribute to the Count of multiple countries/territories or institutions."
Nature Index is a database of institutional affiliations and relationships that tracks contributions to high-quality natural-science and health-science journals selected by an independent group of researchers. The database provides absolute (Count) and fractional (Share) counts at institutional and national levels as indicators of global high-quality research output and collaboration. Count assigns 1 to each country, territory or institution with at least one contributor on a paper. Share apportions a total of 1 per paper equally among contributors and splits a contributor's Share equally across multiple affiliations. Data are updated regularly with the most recent 12 months available under a Creative Commons licence and are compiled by Nature Portfolio. Share calculations for countries can be complicated by overseas labs.
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