The Graduate University for Advanced Studies, SOKENDAI

Research Index

The Research Index ranks a university only when it has at least 1,500 fractionally counted core publications over four years, so that a handful of highly cited papers can’t produce an extreme score. Its field ranks (where it has 200 or more papers in a field) and all of its data are shown here.

The numbers behind it (2020–2023)

Papers in the top 10% of their field

6.8% (5.9%–7.9%)

Papers in the top 1% of their field

0.7% (0.4%–1.0%)

Top-10% papers (fractional count)

41

All papers (fractional count)

597.4

International co-authored

50.6%

Open access

81.4%

Papers from 2020–23 since retracted

1 (0.28 per 1,000)

Core publications, fractional counting, field-normalised citation shares. Brackets show Leiden’s stability interval. Collaboration and open-access shares use full counting and aren’t field-normalised. Retraction counts come from the Retraction Watch database and include publishers’ mass retractions as well as honest-error retractions; a retraction is not by itself evidence of misconduct, and the count is never scored.

By field

Position over time

The same method applied to each 4-year publication window. The number of ranked universities grows from period to period, so position is shown as a share of the field.