Before revision: where is the gross impressions is the Average Quarter-Hour persons, the "average number of persons listening to a particular station for at least five minutes during a 15-minute period" is the total number of spots or commercials is the total number of unique users (or reach Frequency capping is a term in advertising that means restricting (capping) the number of times (frequency) a specific visitor to a website is shown a particular advertisement.
After revision: )Frequency cappingwhere is the gross impressions is the Average Quarter-Hour persons, the "average number of persons listening to a particular station for at least five minutes during a 15-minute period" is the total number of spots or commercials is the total number of unique users (or reach Frequency capping is a term in advertising that means restricting (capping) the number of times (frequency) a specific visitor to a website is shown a particular advertisement.