![]() ![]() Nielsen turns this sample of viewers into a percentage representing total viewership. Researcher Nielsen turns samples of viewers into a percentage representing total TV viewership. This viewer-specific data sets the information Nielsen records apart from data gathered by a regular cable television box. If multiple people, including guests, view a program, each one enters information about his or her age and gender into the box so that the viewing habits of each person can be tracked. ![]() ![]() Each member of a household has his or her viewing habits recorded individually, through indicating who is watching the television at any given time. Every time someone in a Nielsen household turns on a television, he or she indicates which person it is and the box tracks how long the person watches a show.
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