Arbitron Inc. released the first “currency” radio ratings from the Philadelphia Portable People Meter radio ratings service, officially inaugurating the era of electronic measurement of radio audiences in the United States.
The March Portable People Meter (PPMTM) survey ratings, covering March 8 through April 4, is being delivered to subscribing radio stations, agencies and advertisers to be used in the buy/sell process for radio commercial time and as the basis for making programming decisions.


























