Washington Post - take 2 on Rush ratings

[Richard Chonak]

A. Joseph Ross wrote:
> 
> There was someone on Keith Olberman's program a few days ago who said 
> that with the differences in the way Arbitron does radio ratings and 
> Neilson does TV ratings, he figured Rush's audience was more like 1.4 
> million in TV terms.
> 

What's the difference?  The measurement in terms of quarter-hours?

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--RC