OK...add WDUV reference...my points still stands.
rarely does a station go up a lot in their demo and down in the 6+
Now if you would like to debate the definition of the words rarely and a lot.
My main point again "However, when specific demos are not available, I'll look at 6+ #'s over nothing any day."
You are free to agree or disagree with my opinion.
The reason it seems uncommon to you is that the underlying demo shifts are not publicly revealed.
Here are things from the last couple of years in LA... one single market.
Caveat: in PPM markets it is harder to see these changes as the ratings are monthly. In the diary markets or in diary days in larger ones, a change that affected 12+ negatively while growing 25-54 was much more clear as it covered 12 weeks rather than 28 days.
KTWV tried to blow off the seniors and geezers in 2013-2014. They did, and 25-54 grew, but not enough.
KRTH blew off the older folks last year, took a ratings hit but grew immediately in 25-54. Afterwards, 25-54 continued to grow.
KKGO eliminated most of the older country, and dipped in 12+ but made up for it in slightly better sales demos in a decidedly non-country market.
KOST took advantage of the Christmas music holiday period to slipstream a music update. The decline in 12+ was masked by Christmas and they came back stronger in 25-54. Very skillfully done.
A few years back, KBIG transitioned to Hot AC, and blew away a lot of 12+ but made it up quickly in 25-44 gains.
A few months ago, KRCD freshened its music and blew off some 12+ but reinforced 18-49. The transition can be seen clearly in the last three weeks.
92.3 changed format and kicked off with 10,000 joints in a row. That attracted the youngest audience segment. They then added a morning show which blew off the young part while improving the 25-34.
KFI has been on an ongoing campaign to shed geezers and improve 25-54. The 12+ losses mask slight 25-54 gains. Since this is an AM talk station, it will move at the speed of an aging snail.
And that's just the more apparent ones in recent years in one market. This kind of refreshing is very, very common as stations readjust to keep the demographic profile constant. Usually it is so gradually done that the 12+ change looks like a wobble and the younger demo changed so minimally that it was masked too.