Measuring ratings
Ratings/share and total viewers
The most commonly cited Nielsen results are reported in two measurements: ratings points and share, usually reported as (ratings points/share). As of August 27, 2007, there are an estimated 112.8 million television households in the United States. A single national ratings point represents one percent of the total number, or 1,128,000 households for the 2006-07 season. Share is the percentage of television sets in use tuned to the program.
For example, Nielsen may report a show as receiving a 9.2/15 during its broadcast, meaning that on average 9.2 percent of households were tuned in at any given moment. Additionally, 15 percent of all televisions in use at the time were tuned into this program. Nielsen re-estimates the number of households each August for the upcoming television season.
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