surfdude said:
David - what are agencies using for their buys with PPM? Weeklies, Monthlies, one year average?
Have you seen Tampa's first PPM? Check out WRBQ? Which is closer to the truth, the recent diary report or this PPM?
Huge difference. Makes you question Aribitrons accuracy any way you look at it.
First, ratings are supposed to measure only two things. First, the station listened to (cume) and then the amount of time (TSL). Every other figure is derived from these two. Unfortunately, the diary measured memory as well. For this reason, stations with very big top of mind awareness got credit in the diary for long hours of listening due to rounding. And stations on in workplaces and such lost lots of "I did not pick the station" listening. THe PPM favors stations that get lots of "hearing" and that explains WCBS FM, WOGL, KRTH, WRBQ, WMXJ, etc.
The PPM methodology (sample issues aside) measures more accurately as it does not round, vote, or otherwise depend on memory to recall what was listened to all day. The diary represents 50's and 60's technology, and was used only because there was no viable alternative that could overcome the deficiencies of the diary.
Agencies don't get the data in the same format and software as stations. And they don't get weeklies. Many agencies, as they did with the diary, use multi-month (or multi book) averages. Like radio, agencies are just learning to use the PPM data so there will be many opinions on how to use the data.
Keep in mind that the huge majority of the panelists this week were last' week's panelists and last month's panelists and last Spring's panelists, too. In the diary, every week was a new sample.