It differed from the method being used by the advertising industry service Clark - Hooper 's method involved contacting listeners during the shows being analyzed as opposed to the following day .
The advertising industry service is the Cooperative Analysis of Broadcasting ( CAB ) ; in particular .
It differed from the method being used by the advertising industry service , the Cooperative Analysis of Broadcasting ( CAB ) ; in particular , Clark - Hooper 's method involved contacting listeners during the shows being analyzed as opposed to the following day .