I am looking for information on the invention of GRP.
I have found (if I am correct) that its origin lies in radio and was later adopted by broadcasters but who was the father of the gross rating point and when was it invented.
Thank you in advance for your help,
The earliest citation the Guru can find, based on Oxford Dictionaries states that the origins of audience ratings is
"1940s; earliest use found in Annals of the American Academy of Political and Social Science."
However, tracking down this apparent source,at SagePub Annals of the American Academy of Political and Social Science. shows this exerpt:
"Possible Social Effects of Television
The ANNALS of the American Academy of Political and Social Science, January 1941; vol. 213, 1: pp. 145-152.
...have been rated by the audience on the following basis: Excellent, 3; Good, 2; Fair, 1; Poor, 0. The average audience rating of an entire week's programs usually lies between 2.0 and 2.3, while the best program of the week (usually..."
Obviously this is a TV reference and implikes that the term "Rating Point" is already well understood in the industry, no doubt from earlier radio usage.
Adding the term "Gross" merely indicates a summing of the ratings. GRP was not "invented" per se, but is an mathematical artifact of the need to measure audience.