PS: By-The-Way...

Have you ever wondered how many people in your market are represented by one single diary keeper or meter?

To find the "PPDV" (person per diary value), divide the in-tab sample from any geographic, age, or sex in to the total population of that cell. Do the same with "PPMV," but be prepared to have your hair stand on end.

The result is the number of people each diary represents within that cell.

You'll see WHY one diary keeper is so important to your station and one metered family who happens to listen more than two or three times per day to you is even MORE so.