Gross Rating Point
In advertising, a Gross Rating Point (GRP) measures the size of an audience that an advertisement impacts. GRPs help answer how often must someone see it before they can readily recall it, and how many times does it take before the desired outcome occurs
GRPs are used predominantly as a measure of media with high potential exposures of impressions.
One GRP is one percent of all potential adult television viewers in a market. If they are exposed to the ad three times, then that is 3 GRPs.
GRPs are total impressions related to the size of the target population:
$$ \text{GRPs(%)} = 100 \cdot \frac{\text{Total Impressions (#)}}{\text{Defined population (#)}} $$$$ \text{GRPs(%)} = 100 \cdot \frac{\text{Reach (%)}}{\text{Average frequency (#)}} $$Example: If 100,000 ad impressions are displayed on multiple episodes or TV stations for a defined population of 100,000 people, the total is 100 GRPs. However, total reach is not always 100%.
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