C. E. Hooper
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The C. E. Hooper Company was an American company which measured radio and television ratings during the "Golden Age" of radio. Founded in 1935, the company provided information on the most popular radio shows of the era. This information was valuable to the radio networks NBC, CBS, ABC and Mutual Broadcasting System, as it would allow them to charge advertisers more for a popular series than a less popular series.
Starting in 1948, as the radio networks began venturing into television, Hooper began measuring TV ratings as well. In February of 1950, though, the company was bought by competitor ACNielsen. The company is barely remembered today, but during the late 1940s "How's your Hooper?", a reference to how large a series' audience was, was a familiar catchphrase.