Why is the Nature Index based on articles from 68 journals?

The researcher panels who selected the journals have aimed initially for fewer than 100 titles — enough to provide inclusivity of many disciplines but sufficiently selective to ensure that the journals truly reflect the upper tiers of research achievement as judged by peers. The 68 journals included in the first release of the Nature Index represent less than 1% of the journals covering natural sciences in the Web of Science but account for close to 30% of total citations to natural science journals. The composition and total number of journals included in the Nature Index will be reviewed on a regular basis.

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