Columbia, MD - Mar 31, 2011 - The Media Rating Council (MRC) has accredited the monthly average-quarter-hour radio ratings data produced by the Arbitron Portable People Meter radio ratings service in 11 additional markets: Atlanta; Cincinnati; Cleveland; Kansas City; Milwaukee-Racine; Philadelphia; Phoenix; Portland, OR; Salt Lake City-Ogden-Provo; St. Louis and Tampa-St. Petersburg-Clearwater. These 11 markets join Houston-Galveston; Minneapolis-St. Paul and Riverside-San Bernardino as accredited markets for Arbitron's PPM ratings service, bringing the total number of MRC-accredited PPM markets to 14.

MRC accreditation has been denied in the other 34 PPM markets based on the findings of the 2010 audits. These markets along with the 14 accredited markets will be audited again in 2011. Arbitron submits each of the 48 markets to annual audits.

The MRC has also accredited the PPM Analysis Tool. Designed specifically for monthly average-quarter-hour PPM data, the PPM Analysis Tool is a software application that provides standard audience analysis reports including rankers, trend reports and audience composition reports. The software also provides ability to analyze audience estimates based on customized demographics and dayparts.