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Ratings point is a measure of viewership of a particular television program. One single television ratings point (or TVR) represents 1% of viewers in the surveyed area in a given minute. As of 2004, there are an estimated 109.6 million television households in the USA. Thus, a single national household ratings point represents 1%, or 1,096,000 households for the 2004-05 season. When used for the broadcast of a program, the average rating across the duration of the show is typically given. Ratings points are often used for specific demographics rather than just households. For example a ratings point among the key 18-49 year olds demographic is equivalent to 1% of all 18-49 year olds in the country. A TVR is different to a share point in that it is the percentage of all possible viewers, while a share point is 1% of all viewers watching television at the time. Hence the share of a broadcast is often significantly higher than the TVR, especially at times when overall TV viewing is low.
GRPs
Gross ratings points (GRPs) are chiefly used to measure the performance of TV-based advertising campaigns, and are the sum of the TVRs of each commercial spot within the campaign. An ad campaign might require a certain number of GRPs among a particular demographic across the duration of the campaign. The GRP of a campaign is equal to the percentage of people who saw any of the spots, multiplied by the average number of spots that these viewers saw.
Television ratings in India
Television Rating Point (TRP) is used by television advertisers to monitor the most widely watched TV programs in India based on which AD rates for a program is decided. Basically this is the ranking list of popular TV programs released by INTAM every week. INTAM (Indian Television Audience Measurement) is the electronic rating agency functioning in India. 'People meters' are installed in sample homes and these electronic gadgets continuously record data about the channel watched by the family members and the agency prepares a national data on the basis of its sample homes readings. Based on the ranking list of the last several years, programs of SUN TV and Star Plus are in the top rank at all India levels. [1]
