GROSS RATING POINTS (GRP's): the total number of In-Market Impressions (18+) delivered by an out of home schedule expressed as a percentage of a market population. One rating point represents impressions equal to 1% of the market population.
TARGET RATING POINTS (TRP's): The total number of target specic In-Market Impressions delivered by an out of home schedule expressed as a percentage of a target specific market population. One target rating point represents impressions equal to 1% of the target market population.
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