Arbitron - Everything Radio!
Arbitron Radio Ratings and Media Research Information

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Arbitron Inc. (NYSE: ARB) is a media and marketing research firm serving the media—radio, television, cable, online radio and out-of-home—as well as advertisers and advertising agencies in the United States. Arbitron’s core businesses are measuring network and local-market radio audiences across the United States; surveying the retail, media and product patterns of local-market consumers; and providing application software used for analyzing media audience and marketing information data. The company has developed the Portable People Meter™, a new technology for media and marketing research.