While PPM may not be the best way to determine ratings, it's definitely more accurate than a diary. I remember when my family was selected to fill out a Nielsen diary one time, I had to miss my favorite show, but I still wrote that I watched it because I didn't want to see it canceled (and I'm usually a rather honest person).
I can see why KODA, KHMX, and other "safe" music stations are doing best -- for me, those would be the only music stations my PPM would pick-up if I had one now. With so many people relying on their iPod or satellite radio these days, you'll find that the only stations that the PPM will pick up will be the ones playing at their office, retail store, etc. (By the way, I do still listen to AM talk radio, but for music, there isn't a station fitting my needs -- Adult Alternative)
I can see why KODA, KHMX, and other "safe" music stations are doing best -- for me, those would be the only music stations my PPM would pick-up if I had one now. With so many people relying on their iPod or satellite radio these days, you'll find that the only stations that the PPM will pick up will be the ones playing at their office, retail store, etc. (By the way, I do still listen to AM talk radio, but for music, there isn't a station fitting my needs -- Adult Alternative)