ArtSpooner said:
I guess I need it explained like I was three year old. How can you tell, from that chart, how long the audience is listening? What does the % represent......percentage of the audience? Which is the more important number......% or cume?
There are two basic dimensions to radio listening: how many different people tune in, and how long they stay tuned. The first is cumulative audience, or "cume". The second is average time spent listening, or "TSL".
The percentages are average quarter-hour shares, that is, what percentage of the total radio audience is listening to a given station during an average quarter hour. It's related to cume and TSL thus:
[(Quarter-Hours in a time period) x (AQH Persons)] / Cume Audience = TSL
AQH persons is the same thing as share, but expressed as a number of persons rather than a percentage of the whole. It's been a while since I've seen an Arbitron report, but I think in the Boston market one percent is somewhere between three and four thousand persons.
While there are a few exceptions -- the classic WINS "give us 22 minutes, we'll give you the world" news format comes to mind -- most stations try to maximize TSL, as it's generally easier to keep someone tuned in than to get new people to tune in,
A former colleague of mine once told me there's little a programmer can do to reach someone who isn't already listening. For that you need marketing.
See
http://www.arbitron.com/radio_stations/tradeterms.htm for more.