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The A.C. Nielsen company, which continues to measure television ratings today, took over American radio's ratings beginning with the 1949–50 radio season and ending in 1955–56. [40] During this era, nearly all of radio's most popular programs were broadcast on one of three networks: NBC Red, NBC Blue, or CBS' Columbia network.
The company subsequently expanded into radio market analysis in the late 1930s, culminating in the Nielsen Radio Index in 1942, [14] which was meant to provide statistics as to the markets of radio shows. The first Nielsen ratings for radio programs were released the first week of December 1947.
Nielsen Audio (formerly Arbitron) is a consumer research company in the United States that collects listener data on radio broadcasting audiences. It was founded as the American Research Bureau by Jim Seiler in 1949 and became national by merging with Los Angeles–based Coffin, Cooper, and Clay in the early 1950s. [2]
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List of Canadian stations available in the United States; List of United States over-the-air television networks; List of TV markets and major sports teams; List of the Caribbean television channels; Lists of television stations in North America; List of radio stations in North America by media market; U.S. broadcast television template ...
Time spent listening (TSL) is one of the measurements surveyed by Nielsen Audio in determining ratings for radio stations in the United States.It is the equivalent of Average Time Exposed (ATE), Daily or Weekly.
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This is a list of U.S. weekly (or smallest available unit for time period) television ratings archives from 1948 through 1997. (Primarily Nielsen ratings) . National Nielsen ratings for United States television viewing began in March 1950.