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The American television measurement by Nielsen is based on three different methodological approaches. In the 25 TV markets with the highest sales (e. g. New York, Los Angeles) the Local People Meter (LPM) is measured. Individuals register individually, the measurement is carried out on 365 days over 24 hours. The SET Meter (Diary & Electronic) is used in 31 smaller markets (such as Nashville, Salt Lake City). In four sweeps in the months of February, May, July and November, target group data are collected with the diary and validated with the data of the devices (TV set on/off) in the participating households. In the 154 TV markets with the lowest sales (e. g. Harrisburg, PA or Honolulu) the use of TV is only recorded by means of a diary survey.

For example, Nielsen may report a show as receiving a 4.4/8 during its broadcast; this would mean that out of all television-equipped households (that is to say homes with a TV set, not total number of people), 4.4% were tuned in to that program, while among those households watching TV at the time 8% of them watched.

The number of persons age 2 and older in U.S. TV Households is estimated to be 304.5 million.

There are 119.6 million TV homes in the U.S. for the 2017-18 TV season (Nielsen’s National Television Household Universe Estimates).