Arbitron Bolsters Sample for Diary and PPM Services with New Cell Phone Enhancements

COLUMBIA, Md., April 26 /PRNewswire-FirstCall/ -- Arbitron Inc. (NYSE: ARB) announced today that effective with the Spring 2010 Diary survey and the March 2010 Portable People Meter™ ratings service, the company is now including cell phone households that rarely or never answer their landlines

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