Nielsen Audio
Nielsen Audio (formerly Arbitron ) (NYSE: ARB) is a research company based in the United States. It is the market leader in range studies for radio stations .
Founded in 1949, the company is based in Columbia . It had sales of $ 376 million in 2009. The number of employees was 1,300. The company developed the Portable People Meter , which can record listening habits much more precisely than the previous survey methods for radio use, which were largely based on surveys.