Guides
Fact-sheet guides to the measurement record: definitions, eras, and provider comparisons.
How Nielsen ratings work
The definitions this site applies to Nielsen figures, and the events on Nielsen's record.
Updated 2026-09-01
Nielsen vs AdImpact
Every telecast where both providers published a comparable figure, and the gap between them.
Updated 2026-09-01
Nielsen measurement eras: a guide
Nielsen measurement eras on the record, from the eras table.
Updated 2026-09-01