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

Every telecast where both providers published a comparable figure, and the gap between them.

Updated 2026-09-01

Nielsen measurement eras on the record, from the eras table.

Updated 2026-09-01