Sets In Use - Total number of television sets that are turned on at a particular time. This differs from HUT (Homes Using Television), because most households have more than one TV set.
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Sets in use (SIU) The percent of television sets that are tuned into a particular broadcast during a specific amount of time. Share-of-audience The percent of audiences that are tuned into a particular medium at a given time, e.g.
Households Using Television (HUT)
The percentage of all television households in a survey area with one or more sets in use during a specific time period.
 See also: Rating, Data, Sweeps, Household, Audience
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