Frequently asked questions

1. What data is held in the Nature Index?

The Nature Index database captures all affiliation information of primary research articles published within 82 science journals that were selected based on reputation by a panel of active scientists, independently of Nature Portfolio. It also includes links to the abstracts of those articles. It stores whole article counts (referred to by the metric, Count) and fractional article counts (Share) for each article. Behind the snapshot of data published on the website is a database containing the English names, local language names and acronyms of the parent institutions associated with articles tracked by the Nature Index.

2. Why isn’t my article in the Nature Index?

The Index is updated periodically, so there can be a time lag between when your article is published and when it is added to the Nature Index. Your article may be excluded because it was not a primary research article. Sometimes articles may be missed due to technical difficulties. If you believe this may have happened to a particular article, please contact us.

3. Why isn’t my institution in the Nature Index?

Only institutions with at least one affiliated author on a primary research article published in one of the 82 journals tracked by the index will appear in the Nature Index.

4. Which articles are selected for inclusion in the Nature Index? Are all articles treated equally?

The Nature Index includes only primary research articles published in the 82 selected science journals tracked by the Nature Index. For a small number of large physics journals only primary articles identified by the journals as having higher importance, more urgency or more interest for the community are included: notably, articles classified as ‘Highlighted articles’ or ‘Rapid Communications’ from Physical Review A, Physical Review B and Physical Review D; and articles classified as ‘Letters’ from Astronomy and Astrophysics.

All articles are treated equally when ordering institutions and countries by Count and Share.

5. How were journals selected for inclusion in the Nature Index?

The journals tracked by the Nature Index were selected based on reputation by two panels made up of almost 60 actively publishing scientists from across the natural science disciplinary spectrum. The selections were made independently of Nature Portfolio, and validated by a subsequent survey that elicited 6,500 researcher responses. Panelists and survey respondents were asked to list the journals they would most like to publish in and were asked not to consider the Journal Impact Factor. It is intended that the list of journals amounts to a reasonably consensual upper echelon of journals in the natural sciences. It includes both multidisciplinary journals and some of the most highly selective journals within the main disciplines of the natural sciences. The journals included in the Nature Index represent less than 4-5% of the journals covering natural sciences in the Web of Science (Clarivate Analytics) 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 is reviewed on an ongoing basis. The current list of 82 journals was expanded from 68 journals in June 2018 (see Revisions to the Nature Index).

6. Why are articles from only 82 journals included? Why not more?

The selection panels of scientists aimed to ensure there were enough journals to cover many disciplines while maintaining selectivity so that the chosen journals truly reflect the upper tiers of research achievement as judged by peers. The 82 journals included in the second release of the Nature Index represent 4-5% of the journals covering natural sciences in the Web of Science (Clarivate Analytics) but account for close to 30% of total citations to natural science journals (see Introducing the Index). The composition and total number of journals included in the Nature Index is reviewed on a regular basis, with the current revised list of 82 journals released in June 2018. The revision and expansion of the Nature Index journals encompassed a number of changes from the original release, including better representation of each of the subjects covered and the inclusion of new journals that were not available when the index was first released. For more information on the selection of Nature Index journals, see Revisions to the Nature Index.

7. How is article output counted?

Article output is counted in two ways:

  1. Count: where a Count of one is assigned to an institution or country if one or more authors of the research article are from that institution or country, regardless of how many co-authors there are from outside that institution or country.
  2. Share: an institution’s or country/region’s Share takes into account the percentage of authors from that institution or country/region and the number of affiliated institutions per article. For calculation of the Share, all authors are considered to have contributed equally to the article. The maximum combined Share for any article is 1.0.

The ratio of Count to Share gives an indication of the degree to which an institution or country collaborates in its research. Broadly speaking, if the Count is a lot higher than the Share it indicates a high degree of external collaboration and dependency on external resources. If the Count is close in value to the Share it indicates limited collaboration with external researchers and a strong dependency on internal resources.

8. How are the journals and articles categorized by subject?

Research articles are assigned to subjects based on the scientific discipline of the journal in which they are published, with the exception of multidisciplinary journals – Nature, Nature Communications, PNAS, Science and Science Advances. For these journals, subjects are assigned at the article level. Research articles can be assigned to more than one subject. You can view the journals included in a subject by hovering over the ( ℹ︎ ) icon next to the subject on the article results page. View the complete list of journals in each subject.

9. The Nature Index journals

The current 12-month window on nature.com/nature-index/ includes data from primary research articles from the following science journals:

  • ACS Nano (1540 articles)
  • Advanced Functional Materials (2026 articles)
  • Advanced Materials (1581 articles)
  • American Journal of Human Genetics (163 articles)
  • Analytical Chemistry (1922 articles)
  • Angewandte Chemie International Edition (2729 articles)
  • Applied Physics Letters (2172 articles)
  • Astronomy & Astrophysics (80 articles)
  • Cancer Cell (58 articles)
  • Cancer Research (339 articles)
  • Cell (289 articles)
  • Cell Host & Microbe (101 articles)
  • Cell Metabolism (119 articles)
  • Cell Stem Cell (74 articles)
  • Chemical Communications (2746 articles)
  • Chemical Science (1402 articles)
  • Current Biology (506 articles)
  • Developmental Cell (181 articles)
  • Earth and Planetary Science Letters (490 articles)
  • Ecology Letters (178 articles)
  • Environmental Science and Technology (1385 articles)
  • European Physical Journal C (1108 articles)
  • Genes & Development (79 articles)
  • Genome Research (163 articles)
  • Geochimica et Cosmochimica Acta (399 articles)
  • Geology (244 articles)
  • Geophysical Research Letters (1666 articles)
  • Immunity (141 articles)
  • Inorganic Chemistry (1860 articles)
  • Journal of Biological Chemistry (1062 articles)
  • Journal of Cell Biology (216 articles)
  • Journal of Clinical Investigation (364 articles)
  • Journal of Experimental Medicine (205 articles)
  • Journal of Geophysical Research: Atmospheres (724 articles)
  • Journal of Geophysical Research: Solid Earth (693 articles)
  • Journal of High Energy Physics (2539 articles)
  • Journal of Neuroscience (596 articles)
  • Journal of the American Chemical Society (2383 articles)
  • Macromolecules (932 articles)
  • Molecular Cell (223 articles)
  • Molecular Psychiatry (318 articles)
  • Monthly Notices of the Royal Astronomical Society: Letters (127 articles)
  • Nano Letters (1249 articles)
  • Nature (992 articles)
  • Nature Biotechnology (134 articles)
  • Nature Cell Biology (111 articles)
  • Nature Chemical Biology (106 articles)
  • Nature Chemistry (149 articles)
  • Nature Climate Change (107 articles)
  • Nature Communications (6692 articles)
  • Nature Genetics (122 articles)
  • Nature Geoscience (129 articles)
  • Nature Immunology (115 articles)
  • Nature Materials (126 articles)
  • Nature Medicine (202 articles)
  • Nature Methods (116 articles)
  • Nature Nanotechnology (131 articles)
  • Nature Neuroscience (111 articles)
  • Nature Photonics (89 articles)
  • Nature Physics (154 articles)
  • Nature Structural & Molecular Biology (93 articles)
  • Neuron (199 articles)
  • Organic Letters (1670 articles)
  • PLOS Biology (219 articles)
  • PLOS Genetics (445 articles)
  • Physical Review A (337 articles)
  • Physical Review B (1053 articles)
  • Physical Review D (259 articles)
  • Physical Review Letters (2192 articles)
  • Physical Review X (235 articles)
  • Proceedings of the National Academy of Sciences of the United States of America (3227 articles)
  • Proceedings of the Royal Society B (477 articles)
  • Science (702 articles)
  • Science Advances (1882 articles)
  • Science Translational Medicine (282 articles)
  • The Astrophysical Journal Letters (615 articles)
  • The EMBO Journal (230 articles)
  • The ISME Journal: Multidisciplinary Journal of Microbial Ecology (227 articles)
  • The Journal of Physical Chemistry Letters (1446 articles)
  • The Plant Cell (163 articles)
  • Water Research (1008 articles)
  • eLife (1712 articles)

10. Regions

  • Africa

    • Algeria
    • Angola
    • Benin
    • Botswana
    • Burkina Faso
    • Burundi
    • Cameroon
    • Cape Verde
    • Central African Republic
    • Chad
    • Comoros
    • Congo
    • Djibouti
    • Egypt
    • Equatorial Guinea
    • Eritrea
    • Ethiopia
    • Gabon
    • Gambia
    • Ghana
    • Guinea
    • Guinea-Bissau
    • Ivory Coast
    • Kenya
    • Lesotho
    • Liberia
    • Libya
    • Madagascar
    • Malawi
    • Mali
    • Mauritania
    • Mauritius
    • Mayotte
    • Morocco
    • Mozambique
    • Namibia
    • Niger
    • Nigeria
    • Reunion
    • Rwanda
    • Sao Tome and Principe
    • Senegal
    • Seychelles
    • Sierra Leone
    • Somalia
    • South Africa
    • Sudan
    • Swaziland
    • Tanzania
    • Togo
    • Tunisia
    • Western Sahara
    • Uganda
    • Zambia
    • Zimbabwe
  • Asia Pacific

    • Australia
    • Bangladesh
    • Bhutan
    • Brunei
    • Cambodia
    • China
    • Cook Islands
    • East Timor
    • Fiji
    • French Polynesia
    • India
    • Indonesia
    • Japan
    • Kiribati
    • Laos
    • Malaysia
    • Maldives
    • Marshall Islands
    • Micronesia
    • Mongolia
    • Myanmar
    • Nauru
    • Nepal
    • New Zealand
    • Niue
    • North Korea
    • Palau
    • Papua New Guinea
    • Philippines
    • Samoa
    • Singapore
    • Solomon Islands
    • South Korea
    • Sri Lanka
    • Taiwan
    • Thailand
    • Tokelau
    • Tonga
    • Tuvalu
    • Vanuatu
    • Vietnam
    • Wallis and Futuna Islands
  • Europe

    • Albania
    • Andorra
    • Armenia
    • Austria
    • Belarus
    • Belgium
    • Bosnia and Herzegovina
    • Bulgaria
    • Croatia
    • Cyprus
    • Czech Republic
    • Denmark
    • Estonia
    • Faroe Islands
    • Finland
    • France
    • Germany
    • Greece
    • Hungary
    • Iceland
    • Ireland
    • Italy
    • Kosovo
    • Latvia
    • Liechtenstein
    • Lithuania
    • Luxembourg
    • Macedonia
    • Malta
    • Moldova
    • Monaco
    • Montenegro
    • Netherlands
    • Norway
    • Poland
    • Portugal
    • Romania
    • Russia
    • San Marino
    • Serbia
    • Slovakia
    • Slovenia
    • Spain
    • Sweden
    • Switzerland
    • Ukraine
    • United Kingdom (UK)
    • Vatican City State (Holy See)
  • North America

    • Antigua and Barbuda
    • Aruba
    • Bahamas
    • Barbados
    • Belize
    • Canada
    • Costa Rica
    • Cuba
    • Dominica
    • Dominican Republic
    • El Salvador
    • Greenland
    • Grenada
    • Guadeloupe
    • Guatemala
    • Haiti
    • Honduras
    • Jamaica
    • Martinique
    • Mexico
    • Netherlands Antilles
    • Nicaragua
    • Panama
    • Saint Kitts and Nevis
    • Saint Lucia
    • Saint Vincent and The Grenadines
    • St. Pierre and Miquelon
    • Trinidad and Tobago
    • United States of America (USA)
  • South America

    • Argentina
    • Bolivia
    • Brazil
    • Chile
    • Colombia
    • Ecuador
    • Guyana
    • Paraguay
    • Peru
    • S. Georgia and S. Sandwich Isls.
    • Suriname
    • Uruguay
    • Venezuela
  • Western Asia

    • Armenia
    • Afghanistan
    • Azerbaijan
    • Bahrain
    • Georgia
    • Iran
    • Iraq
    • Israel
    • Jordan
    • Kazakhstan
    • Kuwait
    • Kyrgyzstan
    • Lebanon
    • Oman
    • Palestine
    • Pakistan
    • Qatar
    • Saudi Arabia
    • Syria
    • Tajikistan
    • Turkey
    • Turkmenistan
    • United Arab Emirates
    • Uzbekistan
    • Yemen

11. Subjects/journal groups

  • Chemistry

    • Advanced Materials
    • Analytical Chemistry
    • Angewandte Chemie International Edition
    • Chemical Communications
    • Chemical Science
    • Inorganic Chemistry
    • Journal of the American Chemical Society
    • Macromolecules
    • Nano Letters
    • Nature (only articles classified in this subject area)
    • Nature Chemical Biology
    • Nature Chemistry
    • Nature Communications (only articles classified in this subject area)
    • Nature Materials
    • Nature Nanotechnology
    • Organic Letters
    • Proceedings of the National Academy of Sciences of the United States of America (only articles classified in this subject area)
    • Science (only articles classified in this subject area)
    • Science Advances (only articles classified in this subject area)
    • The Journal of Physical Chemistry Letters
  • Earth & Environmental Sciences

    • Earth and Planetary Science Letters
    • Ecology Letters
    • Environmental Science and Technology
    • Geochimica et Cosmochimica Acta
    • Geology
    • Geophysical Research Letters
    • Journal of Geophysical Research: Atmospheres
    • Journal of Geophysical Research: Solid Earth
    • Nature (only articles classified in this subject area)
    • Nature Climate Change
    • Nature Communications (only articles classified in this subject area)
    • Nature Geoscience
    • Proceedings of the National Academy of Sciences of the United States of America (only articles classified in this subject area)
    • Science (only articles classified in this subject area)
    • Science Advances (only articles classified in this subject area)
    • Water Research
  • Life Sciences

    • American Journal of Human Genetics
    • Cancer Cell
    • Cancer Research
    • Cell
    • Cell Host & Microbe
    • Cell Metabolism
    • Cell Stem Cell
    • Current Biology
    • Developmental Cell
    • Ecology Letters
    • eLife
    • Genes & Development
    • Genome Research
    • Immunity
    • Journal of Biological Chemistry
    • Journal of Cell Biology
    • Journal of Clinical Investigation
    • Journal of Experimental Medicine
    • Journal of Neuroscience
    • Molecular Cell
    • Molecular Psychiatry
    • Nature (only articles classified in this subject area)
    • Nature Biotechnology
    • Nature Cell Biology
    • Nature Chemical Biology
    • Nature Communications (only articles classified in this subject area)
    • Nature Genetics
    • Nature Immunology
    • Nature Medicine
    • Nature Methods
    • Nature Neuroscience
    • Nature Structural & Molecular Biology
    • Neuron
    • PLOS Biology
    • PLOS Genetics
    • Proceedings of the National Academy of Sciences of the United States of America (only articles classified in this subject area)
    • Proceedings of the Royal Society B
    • Science (only articles classified in this subject area)
    • Science Advances (only articles classified in this subject area)
    • Science Translational Medicine
    • The EMBO Journal
    • The ISME Journal: Multidisciplinary Journal of Microbial Ecology
    • The Plant Cell
  • Physical Sciences

    • ACS Nano
    • Advanced Functional Materials
    • Advanced Materials
    • Applied Physics Letters
    • Astronomy & Astrophysics
    • European Physical Journal C
    • Journal of High Energy Physics
    • Monthly Notices of the Royal Astronomical Society: Letters
    • Nano Letters
    • Nature (only articles classified in this subject area)
    • Nature Communications (only articles classified in this subject area)
    • Nature Materials
    • Nature Nanotechnology
    • Nature Photonics
    • Nature Physics
    • Physical Review A
    • Physical Review B
    • Physical Review D
    • Physical Review Letters
    • Physical Review X
    • Proceedings of the National Academy of Sciences of the United States of America (only articles classified in this subject area)
    • Science (only articles classified in this subject area)
    • Science Advances (only articles classified in this subject area)
    • The Astrophysical Journal Letters