Arbitron Inc. provides media and marketing information services in the United States and internationally. The company's services include radio audience estimates and related services to radio stations, advertising agencies, and advertisers in the United States; estimating national radio audiences and the size and composition of audiences of network radio programs and commercials; and providing software used for accessing and analyzing its media audience and marketing information data. It also provides consumer, shopping, and media usage information services to radio, cable television, advertising, advertisers, retailers, out-of-home media, and online media industries, as well as to broadcast television and print media industries. The company was formerly known as Ceridian Corporation. Arbitron Inc. was founded in 1912 and is headquartered in Columbia, Maryland.