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I've explained this before...coming from my background working with ratings. As any statistician will tell you, you can bend numbers to say lots of things and mean little. This is the case with Rushbo.
First of all, radio ratings are an estimate that used formulas developed decades ago. Just in recent years they've gone to a more high-tech approach. The old system used 15 minute "samples"...people who wrote down on diaries that they listened to his show (recall). 15 solid minutes, that's all that counts.
The 20 million number is one that is supposedly based on a weekly cumulative audience or total number of ears that tune in. It could be the same person 5 times or a "gawker" who popped in for those golden 15 minutes and never bothered to tune in again or someone who meant Station A but put down Station B or messed up the call-letters badly that the rating's company makes their best guestimate.
Now note I say "supposedly", since these numbers of Rushbo's have been thrown aruond for years with no backing ratings data. Part of it is that radio ratings are highly guarded secrets and only the big numbers are published. Also, radio has seen a big fall in audience in all ages over the past several years, thus what was claimed in the past has no merit today.
Olbermann did a wonderful breakdown not long ago and his estimate, not far off from mine, is that Rushbo probably attracts 2-3 million listeners per day...and that's being generous. The fact that ratings are so tightly controlled, it's a game his people like to play cause it's all but impossible to prove or disprove it.
Cheers...
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