Arbitron updated its plans Friday (Oct. 2) to increase the sample sizes in its portable people meter markets.
The radio ratings firm said it would increase by 10 percent its sample among persons 18-54 by mid-year 2011, a slip of six months from the original plan. In July 2008 Arbitron said it would increase by 10 percent its sample among persons 12 and older by the end of 2010.
The new plan calls for the increase to be phased-in over time with an 8 percent sample increase by the end of 2010, when Arbitron will have completed the roll out of the PPM to the top 50 markets.
As part of the sample increase plan, Arbitron also said it planned to maintain a minimum sample target of at least 750 active panel participants age 6 and older by mid-year in most of its PPM markets.
“This new plan to increase sample targets for persons aged 18-54 complements our recently announced commitment to increasing the number of cell-phone-only households in all PPM markets,” said Michael Skarzynski, CEO and president of Arbitron.