Nielsen Ratings one calls the ratingses of the American television. For their measurement the company Nielsen Media Research is responsible. The system was developed into the 1960ern by Arthur Nielsen, so that the concrete target group speech could be better analyzed by television commercial.

Measurement

Nielsen Media Research determines the ratingses by the "Nielsen Boxes", which are located in selected TV-households. These small computers are connected with the TV-equipment and the voice grade channel. Each use of the television is registered and conveyed at night over the voice grade channel as a packet at Nielsen Media Research.

Additionally to the data acquisition over Nielsen Boxes determines the enterprise the ratingses also over (telephone) inquiries to the seen programs.

Rating and Share

The Nielsen Ratings is spent in Rating and Share. Both data are percentages.

Rating - proportional portion of all TV-households of the USA, which look a concrete program during a certain time interval. Since there were altogether in the TV-season 2004/2005 about 109.6 million TV-households in the USA, a per cent point corresponds to 1.096.000 households. Although a Share is thus indicated in per cent, he permits conclusions on an absolute number.

Share - proportional portion of all households, which see straight up-to-date a concrete program. The Share corresponds to the market share in the German ratings measurement.

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