The total Share for an institution is calculated by summing the Share for individual affiliated authors. For authors who are affiliated with more than one institution, the author’s Share is split equally between each institution. For instance, an article with 10 authors means that each author receives a Share of 0.1. The total Share available per article is 1, which is shared among all authors under the assumption that each contributed equally. To glean a country’s, territory’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. 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. 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. The Nature Index uses Count and Share to track research output. The database is compiled by Nature Portfolio. Data in the Nature Index are updated regularly, with the most recent 12 months made available under a Creative Commons licence at. The Nature Index provides absolute and fractional counts of article publication at the institutional and national level and, as such, is an indicator of global high-quality research output and collaboration. The index tracks contributions to research articles published in 82 high-quality natural-science journals, chosen by an independent group of researchers. The Nature Index is a database of author affiliations and institutional relationships.
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