Arbitron, in response to complaints from clients over its new total audience-measurement service, is clarifying that it will separate data for "one-to-many" sources, including broadcast radio, satellite radio and non-customizable online radio, from information about "one-to-one" services, such as Clear Channel's iHeartRadio, CBS Radio's Radio.com and Pandora. Arbitron is aiming to be a "one-stop shop" for radio metrics, but has a rival in Triton Digital, which is offering information from its national monthly webcast service for local markets.

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