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

The average length of time that listeners to a station spend with that station. This is calculated by dividing the Weekly Hours by the Weekly Reach.

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 Average Hours for a station against a Target Market indexed against the All Adult Average Hours for that station. This indicates whether a Target Market is likely to listen to a given station for more or less time, with 100 being the norm.

RAJAR allows more than one main shopper per household in the survey and it can be either male or female.

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.

Some stations at certain times of the day switch their broadcast to a different station, or instance during the news in favour of locally relevant programming. On RAJAR these opt outs are often too small to report separately, therefore their results are incorporated back to the main service (e.g. BBC Bristol has an opt out called Somerset Sound).