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Nielsen Media ResearchNielsen Media Research (NMR) is a U.S. firm, headquartered in New York City, and operating primarily from Oldsmar, FL, which measures media audiences, including television, radio and newspapers. NMR is best-known for the Nielsen Ratings, a measurement of television viewership. NMR began as a division of ACNielsen, a marketing research firm. In 1996, NMR was split off into an independent company, and in 1999, was purchased by the Dutch conglomerate VNU. In 2001, VNU also purchased ACNielsen, thereby bringing both companies under the same corporate umbrella. NMR is also a sister company to Nielsen//NetRatings, which measures Internet and digital media audiences. External link
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