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The RADAR 95 report from December 2007 indicates that radio audience estimates have consistently remained stable. This report highlights that the audience estimates were generated using varying combinations of Portable People Meter (PPM) and Diary respondents until 2011, when a consistent measurement approach was adopted. The data covers all radio usage among persons aged 12 and above, providing insights into weekly cumulative persons and ratings for the Monday to Sunday period from 6 AM to midnight, as sourced from RADAR 75 to RADAR 115.
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Radio’s Weekly Reach Remains Consistent ## Indicateds that beginning with the RADAR 95 December 2007 report, the audience estimates produced may be based on varying combinations of PPM and Diary respondents until 2011 when measurement mix became consistent Source: RADAR 75 Fall 2002 - RADAR 115, December 2012; Radio Usage; All Radio; Persons 12+; Monday-Sunday 6am-12midnight; Weekly Cume Persons and Rating.