How are audience impressions calculated in BDS?

How are audience impressions calculated in BDS?

Audience impressions for airplay are presented in many MRC Data products including BDSradio, BDSRealtime, Music Tracking and Connect.

  1. Audience information for US radio stations is provided by Nielsen Audio (formerly Arbitron).
  2. Audience information for Canadian radio stations is provided by Numeris (formerly BBM).
  3. Audience information for Mexican radio stations is provided by INRA.
  4. MRC Data uses 12+ AQH information to determine audience impressions for each hour of the day for each weekday and for Sat and Sun. AQH Persons is defined as the average number of persons estimated to have listened to a station for a minimum of five minutes during any quarter hour in a time period.
  5. Nielsen Audio gathers audience information in larger markets through their portable PPM devices. In smaller markets, a diary methodology is used. Audience information in the BDS system is loaded each month (for PPM markets) or each quarter (for Diary markets).
  6. Audience information for non-monitored Indicator stations is presented in the Music Tracking application. For Indicator stations BDS uses Nielsen Audio's 12+ Mon-Sun 6am-12midnight AQH Persons number for each station and applies that number of audience impressions to each reported spin.
  7. If a monitored or Indicator station does not have audience information available from Nielsen Audio, Numeris or INRA then default audience of 1(00) audience impressions per spin is presented.
  8. Nielsen Audio collects data by selecting a random sample of a population throughout the United States, primarily in 270+ metropolitan areas, using a paper diary service 2‑4 times a year and the Portable People Meter (PPM) electronic audience measurement service 365 days a year. Nielsen Audio recruits diary survey respondents to note their listening habits in a seven-day diary. The respondents are paid a small cash incentive for their participation.
  9. Major ratings products include cume (the cumulative number of unique listeners over a period), average quarter hour (AQH - the average number of people listening in a given 15‑minute period), time spent listening (TSL), and market breakdowns by age, gender, and race/ethnicity. It is important to understand that the "cume" only counts a listener once, whereas the AQH is a product of "cume" and time spent listening. For example, if you looked into a room and saw Fred and Jane, then 15 minutes later saw Fred with Sara. The "cume" would be 3 (Fred, Jane, Sara) and the AQH would be 2 (an average of two people in the room in a given 15‑minute period).
  10. The PPM is a wearable portable device, much like a pager or mobile phone, that electronically gathers subaudible codes that identify the source of a broadcast, such as a radio station. Nielsen Audio recruits and compensates a cross-section of consumers to wear the meter for an average of one year and up to two years. The audience estimates generated from each monthly survey is used as the buy/sell currency for radio stations and advertisers/agencies. PPM measurement is used in the 48 largest radio markets.
  11. Audience information for US video channels is provided by Nielsen - please note that only certain video channels have audience information available.
​In some MRC Data products, audience impressions are presented in hundreds. So two zeros ("00") need to be added to those numbers to determine audience impressions.



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