Measurement you can check, including where it fails.
Every study here states its cohort and the window, publishes the numerator and the denominator, shows an interval, lists what it excluded and why, and names the claims the evidence does not support. Where a result is too small to carry a rate, we report that instead of a rate. The aggregate data ships with the study so anyone can run the same calculation against their own.
The AI engine index
How often each AI answer engine cites a source, how many it cites, and what kind of sites they are, from anonymised measurements across workspaces.
Anonymised measurements across workspaces · every figure from at least five workspaces, none above half
The published figures (CSV)Field notes
Shorter measurements and one-off checks. Same reporting rules, smaller scope.
How we report. The calculation and reporting contract behind these pages is published in full on our methodology page. Where a published number later changes, the study says what changed and when, rather than being rewritten in place.
