Glossary of Common Radio Terms:

Average Quarter-Hour Persons - The estimated number of persons who listened to a station for a minimum of five minutes within a given quarter hour.

Metro Survey Area (MSA) - These areas generally correspond to Standard Metropolitan Statistical Areas as defined by the US Office Management and Budget.

Rating - The average Quarter-Hour Persons estimated expressed as a percentage of the universe.

Sampling Unit - A geographic area consisting of a single county, a group of counties or a part of a county.

Universe - The estimated number of persons in the geographic area being reported; categorized by sex and age group.