bigtime said:The diary method would count only those people who are actually paying enough attention to know what they are listening to.
Really?
Does that account for the people who claim to listen to WXXX 24 hours a day?
Does that account for the people who write down that they still listen to WQQQ two years after that station went dark?
PPM does not measure "listening"; it measures "exposure."
The diary method never measured "listening" either; it measured "recall" and "loyalty."