From next-day snapshots to (extremely) long tail measurements, The Hollywood Reporter breaks down what different types of TV-viewing numbers mean.
A story from the analog days of TV ratings: Until the early 2000s, the way network executives, reporters and others interested in the previous night's audience had to make a phone call.
After a certain time each morning, the overnight ratings would come in from Nielsen, and someone from the network would recite the numbers onto a dedicated line, which then was available for anyone who wanted to dial in and hear how shows performed.Those overnight ratings still come each morning , but they're followed by a host of other data: three-day, seven-day, multi-platform, commercial. Theoretically, a TV outlet could count the digital audience of its show for as long as it wants.
Here's a rundown of the various streams of ratings data, starting with the most basic bit of information. The Nielsen ratings are calculated based on a sample of 40,000 homes and about 100,000 people that's demographically representative of the population as a whole. It's a small fraction of the 120 million or so homes with TV, but also a lot more than, say, a typical political poll that surveys just a couple thousand people.Ratings are essentially percentages, measuring the portion of a given group — be it households, adults 18-49 or women 25-54 — watching a given show.
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