Arbitron PPM Sample Size Metrics Hit New Highs in January 2010

COLUMBIA, Md., March 1 /PRNewswire-FirstCall/ -- Arbitron, Inc. (NYSE: ARB) announced today that it met or exceeded substantially all of its sample size metrics across the 33 PPM currency markets in the January 2010 Portable People Meter™ (PPM™) survey.  The average Designated Deliv

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