The area within which a station’s audience is measured. This is defined by the station using postcode districts as building blocks.

Average Hours per Head

Day

The Efficiency Factor indicates the all-time efficiency of a station at delivering a given Target Market. This is calculated by dividing the All Adult Weekly Hours by the Target Market Weekly Hours.

The percentage of all radio listening hours that a station accounts for within its transmission area. This can be calculated for any target market across any area.

Opportunity to hear.

Any station that is not surveyed by RAJAR but for which respondents wrote in as listened to during the diary week is coded to other listening. This would include for instance foreign stations, short term licences; etc ‘Other listening’ contributes towards the ‘All Radio’ total.

The number of people aged 15+ who live within the TSA of a given station.

The Market Share % of a station against a Target Market indexed against the All Adult Weekly Reach % for that station. This indicates whether a Target Market is more or less likely to listen to a given station for more or less time, with 100 being the norm.