Jisho

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延べ視聴率
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Wikipedia definition
1. Gross rating point​Gross rating point (GRP) is a term used in advertising to measure the size of an audience reached by a specific media vehicle or schedule. It is the product of the percentage of the target audience reached by an advertisement, times the frequency they see it in a given campaign (frequency × % reached). For example, a television advertisement that is aired 5 times reaching 50% of the target audience each time it is aired would have a GRP of 250 (5 × 50%).
Read “Gross rating point” on English Wikipedia
Read “延べ視聴率” on Japanese Wikipedia
Read “Gross rating point” on DBpedia

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