Any PPM market is a 24/7 metered market. There are specific ratings breakdowns for each weekend day as well as both given the very different listening habits across the weekend. And stations program to their demos differently on the weekends as well.
The non-subscribed numbers don't see that level of granularity as the broken down data is only contained in the subscribed reports themselves. Not the "public release" stuff.
What's really sad is some really big stations do not subscribe and their numbers are now no longer available to anyone....even subscribers. This makes the whole PPM product less relevant. Station's won't really know if there is a dark horse out there which they need to pay attention beyond what the report does show.
RR
The advertisers and advertising agencies know, and that's what counts.